diff --git a/dev/tools/gen_keycodes/bin/gen_keycodes.dart b/dev/tools/gen_keycodes/bin/gen_keycodes.dart
index d8c22d6c23..dc4241efef 100644
--- a/dev/tools/gen_keycodes/bin/gen_keycodes.dart
+++ b/dev/tools/gen_keycodes/bin/gen_keycodes.dart
@@ -7,10 +7,11 @@ import 'dart:convert';
 import 'dart:io' hide Platform;
 
 import 'package:args/args.dart';
+import 'package:gen_keycodes/cc_code_gen.dart';
 import 'package:http/http.dart' as http;
 import 'package:path/path.dart' as path;
 
-import 'package:gen_keycodes/code_gen.dart';
+import 'package:gen_keycodes/dart_code_gen.dart';
 import 'package:gen_keycodes/key_data.dart';
 import 'package:gen_keycodes/utils.dart';
 
@@ -215,7 +216,24 @@ Future<void> main(List<String> rawArguments) async {
     mapsFile.createSync(recursive: true);
   }
 
-  final CodeGenerator generator = CodeGenerator(data);
+  final DartCodeGenerator generator = DartCodeGenerator(data);
   await codeFile.writeAsString(generator.generateKeyboardKeys());
   await mapsFile.writeAsString(generator.generateKeyboardMaps());
+
+  final CcCodeGenerator ccCodeGenerator = CcCodeGenerator(data);
+  for (final String platform in <String>['android', 'darwin', 'glfw', 'fuchsia', 'linux', 'windows']) {
+    final File platformFile = File(path.join(flutterRoot.path, '..', path.join('engine', 'src', 'flutter', 'shell', 'platform', platform, 'keycodes', 'keyboard_map_$platform.h')));
+    if (!platformFile.existsSync()) {
+      platformFile.createSync(recursive: true);
+    }
+    print('Writing map ${platformFile.absolute}');
+    await platformFile.writeAsString(ccCodeGenerator.generateKeyboardMaps(platform));
+  }
+
+  final File webPlatformFile = File(path.join(flutterRoot.path, '..', 'engine', 'src', 'flutter', path.join('lib', 'web_ui', 'lib', 'src', 'engine', 'keycodes', 'keyboard_map_web.dart')));
+  if (!webPlatformFile.existsSync()) {
+    webPlatformFile.createSync(recursive: true);
+  }
+  print('Writing map ${webPlatformFile.absolute}');
+  await webPlatformFile.writeAsString(generator.generateWebKeyboardMap());
 }
diff --git a/dev/tools/gen_keycodes/data/key_data.json b/dev/tools/gen_keycodes/data/key_data.json
index f3b28991ec..b4c56f7539 100644
--- a/dev/tools/gen_keycodes/data/key_data.json
+++ b/dev/tools/gen_keycodes/data/key_data.json
@@ -191,6 +191,29 @@
       "windows": null
     }
   },
+  "privacyScreenToggle": {
+    "names": {
+      "domkey": "PrivacyScreenToggle",
+      "android": null,
+      "english": "Privacy Screen Toggle",
+      "chromium": "privacyScreenToggle",
+      "glfw": null,
+      "windows": null
+    },
+    "scanCodes": {
+      "android": null,
+      "usb": 23,
+      "linux": 633,
+      "xkb": 641,
+      "windows": null,
+      "macos": null
+    },
+    "keyCodes": {
+      "android": null,
+      "glfw": null,
+      "windows": null
+    }
+  },
   "sleep": {
     "names": {
       "domkey": "Sleep",
@@ -8253,4 +8276,4 @@
       "windows": null
     }
   }
-}
\ No newline at end of file
+}
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_android_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_android_cc.tmpl
new file mode 100644
index 0000000000..aaf84d943a
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_android_cc.tmpl
@@ -0,0 +1,30 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_android_cxx.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+// Maps Android-specific key codes to the matching LogicalKeyboardKey id.
+const std::map<int, int> g_android_to_logical_key = {
+@@@ANDROID_KEY_CODE_MAP@@@
+};
+
+// Maps Android-specific scan codes to the matching PhysicalKeyboardKey id (a.k.a. HID USB code).
+const std::map<int, int> g_android_to_physical_key = {
+@@@ANDROID_SCAN_CODE_MAP@@@
+};
+
+// A map of Android key codes which have printable representations, but appear
+// on the number pad. Used to provide different key objects for keys like
+// KEY_EQUALS and NUMPAD_EQUALS. Maps Android key codes to PhysicalKeyboardKey
+// codes (USB HID codes).
+const std::map<int, int> g_android_numpad_map = {
+@@@ANDROID_NUMPAD_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_darwin_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_darwin_cc.tmpl
new file mode 100644
index 0000000000..96c0d9efb3
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_darwin_cc.tmpl
@@ -0,0 +1,32 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_android_cxx.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+// Maps macOS-specific key code values representing [PhysicalKeyboardKey].
+//
+// MacOS doesn't provide a scan code, but a virtual keycode to represent a physical key.
+const std::map<int, int> g_macos_to_physical_key = {
+@@@MACOS_SCAN_CODE_MAP@@@
+};
+
+// A map of macOS key codes which have printable representations, but appear
+// on the number pad. Used to provide different key objects for keys like
+// KEY_EQUALS and NUMPAD_EQUALS.
+const std::map<int, int> g_macos_numpad_map = {
+@@@MACOS_NUMPAD_MAP@@@
+};
+
+// A map of macOS key codes which are numbered function keys, so that they
+// can be excluded when asking "is the Fn modifier down?".
+const std::map<int, int> g_macos_function_key_map = {
+@@@MACOS_FUNCTION_KEY_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_fuchsia_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_fuchsia_cc.tmpl
new file mode 100644
index 0000000000..01d8dbf81b
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_fuchsia_cc.tmpl
@@ -0,0 +1,23 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_android_cxx.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+/// Maps Fuchsia-specific IDs to the matching LogicalKeyboardKey.
+const std::map<int, int> g_fuchsia_to_logical_key = {
+@@@FUCHSIA_KEY_CODE_MAP@@@
+};
+
+/// Maps Fuchsia-specific USB HID Usage IDs to the matching
+/// [PhysicalKeyboardKey].
+const std::map<int, int> g_fuchsia_to_physical_key = {
+@@@FUCHSIA_SCAN_CODE_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_glfw_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_glfw_cc.tmpl
new file mode 100644
index 0000000000..a2fce7f139
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_glfw_cc.tmpl
@@ -0,0 +1,24 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_android_cxx.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+/// Maps GLFW-specific key codes to the matching [LogicalKeyboardKey].
+const std::map<int, int> g_glfw_to_logical_key = {
+@@@GLFW_KEY_CODE_MAP@@@
+};
+
+/// A map of GLFW key codes which have printable representations, but appear
+/// on the number pad. Used to provide different key objects for keys like
+/// KEY_EQUALS and NUMPAD_EQUALS.
+const std::map<int, int> g_glfw_numpad_map = {
+@@@GLFW_NUMPAD_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_linux_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_linux_cc.tmpl
new file mode 100644
index 0000000000..149cc4826b
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_linux_cc.tmpl
@@ -0,0 +1,17 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_android_cxx.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+/// Maps XKB specific key code values representing [PhysicalKeyboardKey].
+const std::map<int, int> g_xkb_to_physical_key = {
+@@@XKB_SCAN_CODE_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_web.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_web.tmpl
new file mode 100644
index 0000000000..b017be085e
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_web.tmpl
@@ -0,0 +1,27 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+/// Maps Web KeyboardEvent codes to the matching LogicalKeyboardKey id.
+const Map<String, int> kWebToLogicalKey = <String, int>{
+@@@WEB_LOGICAL_KEY_CODE_MAP@@@
+};
+
+/// Maps Web KeyboardEvent codes to the matching PhysicalKeyboardKey USB HID code.
+const Map<String, int> kWebToPhysicalKey = <String, int>{
+@@@WEB_PHYSICAL_KEY_CODE_MAP@@@
+};
+
+/// A map of Web KeyboardEvent codes which have printable representations, but appear
+/// on the number pad. Used to provide different key objects for keys like
+/// KEY_EQUALS and NUMPAD_EQUALS.
+const Map<String, int> kWebNumPadMap = <String, int>{
+@@@WEB_NUMPAD_CODE_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/data/keyboard_map_windows_cc.tmpl b/dev/tools/gen_keycodes/data/keyboard_map_windows_cc.tmpl
new file mode 100644
index 0000000000..48b28913a3
--- /dev/null
+++ b/dev/tools/gen_keycodes/data/keyboard_map_windows_cc.tmpl
@@ -0,0 +1,29 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <map>
+
+// DO NOT EDIT -- DO NOT EDIT -- DO NOT EDIT
+// This file is generated by flutter/flutter@dev/tools/gen_keycodes/bin/gen_keycodes.dart and
+// should not be edited directly.
+//
+// Edit the template dev/tools/gen_keycodes/data/keyboard_maps_windows_cc.tmpl instead.
+// See dev/tools/gen_keycodes/README.md for more information.
+
+/// Maps g_windows_to_physical_key specific key code values representing [PhysicalKeyboardKey].
+const std::map<int, uint64_t> g_windows_to_physical_key = {
+@@@WINDOWS_SCAN_CODE_MAP@@@
+};
+
+/// Maps Windows-specific key codes to the matching [LogicalKeyboardKey].
+const std::map<int, uint64_t> g_windows_to_logical_key = {
+@@@WINDOWS_KEY_CODE_MAP@@@
+};
+
+/// A map of GLFW key codes which have printable representations, but appear
+/// on the number pad. Used to provide different key objects for keys like
+/// KEY_EQUALS and NUMPAD_EQUALS.
+const std::map<int, uint64_t> g_windows_numpad_map = {
+@@@WINDOWS_NUMPAD_MAP@@@
+};
diff --git a/dev/tools/gen_keycodes/lib/cc_code_gen.dart b/dev/tools/gen_keycodes/lib/cc_code_gen.dart
new file mode 100644
index 0000000000..341403a999
--- /dev/null
+++ b/dev/tools/gen_keycodes/lib/cc_code_gen.dart
@@ -0,0 +1,307 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:io';
+import 'package:path/path.dart' as path;
+
+import 'package:gen_keycodes/key_data.dart';
+import 'package:gen_keycodes/utils.dart';
+
+/// Generates the keyboard_keys.dart and keyboard_maps.dart files, based on the
+/// information in the key data structure given to it.
+class CcCodeGenerator {
+  CcCodeGenerator(this.keyData);
+
+  /// Given an [input] string, wraps the text at 80 characters and prepends each
+  /// line with the [prefix] string. Use for generated comments.
+  String wrapString(String input, {String prefix = '  // '}) {
+    final int wrapWidth = 80 - prefix.length;
+    final StringBuffer result = StringBuffer();
+    final List<String> words = input.split(RegExp(r'\s+'));
+    String currentLine = words.removeAt(0);
+    for (final String word in words) {
+      if ((currentLine.length + word.length) < wrapWidth) {
+        currentLine += ' $word';
+      } else {
+        result.writeln('$prefix$currentLine');
+        currentLine = word;
+      }
+    }
+    if (currentLine.isNotEmpty) {
+      result.writeln('$prefix$currentLine');
+    }
+    return result.toString();
+  }
+
+  List<Key> get numpadKeyData {
+    return keyData.data.where((Key entry) {
+      return entry.constantName.startsWith('numpad') && entry.keyLabel != null;
+    }).toList();
+  }
+
+  List<Key> get functionKeyData {
+    final RegExp functionKeyRe = RegExp(r'^f[0-9]+$');
+    return keyData.data.where((Key entry) {
+      return functionKeyRe.hasMatch(entry.constantName);
+    }).toList();
+  }
+
+  /// This generates the map of Flutter key codes to logical keys.
+  String get predefinedKeyCodeMap {
+    final StringBuffer keyCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      keyCodeMap.writeln('    ${toHex(entry.flutterId, digits: 10)}: ${entry.constantName},');
+    }
+    for (final String entry in Key.synonyms.keys) {
+      // Use the first item in the synonyms as a template for the ID to use.
+      // It won't end up being the same value because it'll be in the pseudo-key
+      // plane.
+      final Key primaryKey = keyData.data.firstWhere((Key item) {
+        return item.name == Key.synonyms[entry][0];
+      }, orElse: () => null);
+      assert(primaryKey != null);
+      keyCodeMap.writeln('    ${toHex(Key.synonymPlane | primaryKey.flutterId, digits: 10)}: $entry,');
+    }
+    return keyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of GLFW number pad key codes to logical keys.
+  String get glfwNumpadMap {
+    final StringBuffer glfwNumpadMap = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.glfwKeyCodes != null) {
+        for (final int code in entry.glfwKeyCodes.cast<int>()) {
+          glfwNumpadMap.writeln('  { $code, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return glfwNumpadMap.toString().trimRight();
+  }
+
+  /// This generates the map of GLFW key codes to logical keys.
+  String get glfwKeyCodeMap {
+    final StringBuffer glfwKeyCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.glfwKeyCodes != null) {
+        for (final int code in entry.glfwKeyCodes.cast<int>()) {
+          glfwKeyCodeMap.writeln('  { $code, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return glfwKeyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of XKB scan codes to USB HID codes.
+  String get xkbScanCodeMap {
+    final StringBuffer xkbScanCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.xKbScanCode != null) {
+        xkbScanCodeMap.writeln('  { ${toHex(entry.xKbScanCode)}, ${toHex(entry.usbHidCode)} },    // ${entry.constantName}');
+      }
+    }
+    return xkbScanCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Android key codes to logical keys.
+  String get androidKeyCodeMap {
+    final StringBuffer androidKeyCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.androidKeyCodes != null) {
+        for (final int code in entry.androidKeyCodes.cast<int>()) {
+          androidKeyCodeMap.writeln('  { $code, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return androidKeyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Android number pad key codes to logical keys.
+  String get androidNumpadMap {
+    final StringBuffer androidKeyCodeMap = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.androidKeyCodes != null) {
+        for (final int code in entry.androidKeyCodes.cast<int>()) {
+          androidKeyCodeMap.writeln('  { $code, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return androidKeyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Android scan codes to physical keys.
+  String get androidScanCodeMap {
+    final StringBuffer androidScanCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.androidScanCodes != null) {
+        for (final int code in entry.androidScanCodes.cast<int>()) {
+          androidScanCodeMap.writeln('  { $code, ${toHex(entry.usbHidCode)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return androidScanCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Windows scan codes to physical keys.
+  String get windowsScanCodeMap {
+    final StringBuffer windowsScanCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.windowsScanCode != null) {
+        windowsScanCodeMap.writeln('  { ${entry.windowsScanCode}, ${toHex(entry.usbHidCode)} },    // ${entry.constantName}');
+      }
+    }
+    return windowsScanCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Windows number pad key codes to logical keys.
+  String get windowsNumpadMap {
+    final StringBuffer windowsNumPadMap = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.windowsScanCode != null) {
+        windowsNumPadMap.writeln('  { ${toHex(entry.windowsScanCode)}, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+      }
+    }
+    return windowsNumPadMap.toString().trimRight();
+  }
+
+  /// This generates the map of Android key codes to logical keys.
+  String get windowsKeyCodeMap {
+    final StringBuffer windowsKeyCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.windowsKeyCodes != null) {
+        for (final int code in entry.windowsKeyCodes.cast<int>()) {
+          windowsKeyCodeMap.writeln('  { $code, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+        }
+      }
+    }
+    return windowsKeyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of macOS key codes to physical keys.
+  String get macOsScanCodeMap {
+    final StringBuffer macOsScanCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.macOsScanCode != null) {
+        macOsScanCodeMap.writeln('  { ${toHex(entry.macOsScanCode)}, ${toHex(entry.usbHidCode)} },    // ${entry.constantName}');
+      }
+    }
+    return macOsScanCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of macOS number pad key codes to logical keys.
+  String get macOsNumpadMap {
+    final StringBuffer macOsNumPadMap = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.macOsScanCode != null) {
+        macOsNumPadMap.writeln('  { ${toHex(entry.macOsScanCode)}, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+      }
+    }
+    return macOsNumPadMap.toString().trimRight();
+  }
+
+  String get macOsFunctionKeyMap {
+    final StringBuffer macOsFunctionKeyMap = StringBuffer();
+    for (final Key entry in functionKeyData) {
+      if (entry.macOsScanCode != null) {
+        macOsFunctionKeyMap.writeln('  { ${toHex(entry.macOsScanCode)}, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+      }
+    }
+    return macOsFunctionKeyMap.toString().trimRight();
+  }
+
+  /// This generates the map of Fuchsia key codes to logical keys.
+  String get fuchsiaKeyCodeMap {
+    final StringBuffer fuchsiaKeyCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.usbHidCode != null) {
+        fuchsiaKeyCodeMap.writeln('  { ${toHex(entry.flutterId)}, ${toHex(entry.flutterId, digits: 10)} },    // ${entry.constantName}');
+      }
+    }
+    return fuchsiaKeyCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Fuchsia USB HID codes to physical keys.
+  String get fuchsiaHidCodeMap {
+    final StringBuffer fuchsiaScanCodeMap = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.usbHidCode != null) {
+        fuchsiaScanCodeMap.writeln(' { ${toHex(entry.usbHidCode)}, ${toHex(entry.usbHidCode)} },    // ${entry.constantName}');
+      }
+    }
+    return fuchsiaScanCodeMap.toString().trimRight();
+  }
+
+  /// This generates the map of Web KeyboardEvent codes to logical keys.
+  String get webLogicalKeyMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.flutterId, digits: 10)},    // ${entry.constantName}");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
+  /// This generates the map of Web KeyboardEvent codes to physical keys.
+  String get webPhysicalKeyMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.usbHidCode)},    // ${entry.constantName}");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
+  /// This generates the map of Web number pad codes to logical keys.
+  String get webNumpadMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.flutterId, digits: 10)},    // ${entry.constantName}");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
+  /// Substitutes the various platform specific maps into the template file for
+  /// keyboard_maps.dart.
+  String generateKeyboardMaps(String platform) {
+    // There is no macOS keycode map since macOS uses keycode to represent a physical key.
+    // The LogicalKeyboardKey is generated by raw_keyboard_macos.dart from the unmodified characters
+    // from NSEvent.
+    final Map<String, String> mappings = <String, String>{
+      'ANDROID_SCAN_CODE_MAP': androidScanCodeMap,
+      'ANDROID_KEY_CODE_MAP': androidKeyCodeMap,
+      'ANDROID_NUMPAD_MAP': androidNumpadMap,
+      'FUCHSIA_SCAN_CODE_MAP': fuchsiaHidCodeMap,
+      'FUCHSIA_KEY_CODE_MAP': fuchsiaKeyCodeMap,
+      'MACOS_SCAN_CODE_MAP': macOsScanCodeMap,
+      'MACOS_NUMPAD_MAP': macOsNumpadMap,
+      'MACOS_FUNCTION_KEY_MAP': macOsFunctionKeyMap,
+      'GLFW_KEY_CODE_MAP': glfwKeyCodeMap,
+      'GLFW_NUMPAD_MAP': glfwNumpadMap,
+      'XKB_SCAN_CODE_MAP': xkbScanCodeMap,
+      'WEB_LOGICAL_KEY_MAP': webLogicalKeyMap,
+      'WEB_PHYSICAL_KEY_MAP': webPhysicalKeyMap,
+      'WEB_NUMPAD_MAP': webNumpadMap,
+      'WINDOWS_SCAN_CODE_MAP': windowsScanCodeMap,
+      'WINDOWS_NUMPAD_MAP': windowsNumpadMap,
+      'WINDOWS_KEY_CODE_MAP': windowsKeyCodeMap,
+    };
+
+    final String template = File(path.join(flutterRoot.path, 'dev', 'tools', 'gen_keycodes', 'data', 'keyboard_map_${platform}_cc.tmpl')).readAsStringSync();
+    return _injectDictionary(template, mappings);
+  }
+
+  /// The database of keys loaded from disk.
+  final KeyData keyData;
+
+  static String _injectDictionary(String template, Map<String, String> dictionary) {
+    String result = template;
+    for (final String key in dictionary.keys) {
+      result = result.replaceAll('@@@$key@@@', dictionary[key]);
+    }
+    return result;
+  }
+}
diff --git a/dev/tools/gen_keycodes/lib/code_gen.dart b/dev/tools/gen_keycodes/lib/dart_code_gen.dart
similarity index 88%
rename from dev/tools/gen_keycodes/lib/code_gen.dart
rename to dev/tools/gen_keycodes/lib/dart_code_gen.dart
index 7d80476130..07ddb9929e 100644
--- a/dev/tools/gen_keycodes/lib/code_gen.dart
+++ b/dev/tools/gen_keycodes/lib/dart_code_gen.dart
@@ -10,8 +10,8 @@ import 'package:gen_keycodes/utils.dart';
 
 /// Generates the keyboard_keys.dart and keyboard_maps.dart files, based on the
 /// information in the key data structure given to it.
-class CodeGenerator {
-  CodeGenerator(this.keyData);
+class DartCodeGenerator {
+  DartCodeGenerator(this.keyData);
 
   /// Given an [input] string, wraps the text at 80 characters and prepends each
   /// line with the [prefix] string. Use for generated comments.
@@ -130,7 +130,7 @@ $otherComments  static const LogicalKeyboardKey $constantName = LogicalKeyboardK
     return scanCodeMap.toString().trimRight();
   }
 
-  /// THis generates the map of Flutter key codes to logical keys.
+  /// This generates the map of Flutter key codes to logical keys.
   String get predefinedKeyCodeMap {
     final StringBuffer keyCodeMap = StringBuffer();
     for (final Key entry in keyData.data) {
@@ -312,6 +312,39 @@ $otherComments  static const LogicalKeyboardKey $constantName = LogicalKeyboardK
     return result.toString().trimRight();
   }
 
+  /// This generates the map of Web KeyboardEvent codes to logical key ids.
+  String get webLogicalKeyCodeMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.flutterId, digits: 10)},");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
+  /// This generates the map of Web KeyboardEvent codes to physical key USB HID codes.
+  String get webPhysicalKeyCodeMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in keyData.data) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.usbHidCode)},");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
+  /// This generates the map of Web number pad codes to logical key ids.
+  String get webNumpadCodeMap {
+    final StringBuffer result = StringBuffer();
+    for (final Key entry in numpadKeyData) {
+      if (entry.name != null) {
+        result.writeln("  '${entry.name}': ${toHex(entry.flutterId, digits: 10)},");
+      }
+    }
+    return result.toString().trimRight();
+  }
+
   /// Substitutes the various maps and definitions into the template file for
   /// keyboard_key.dart.
   String generateKeyboardKeys() {
@@ -354,6 +387,19 @@ $otherComments  static const LogicalKeyboardKey $constantName = LogicalKeyboardK
     return _injectDictionary(template, mappings);
   }
 
+  /// Substitutes the web specific maps into the template file for
+  /// keyboard_map_web.dart in the engine.
+  String generateWebKeyboardMap() {
+    final Map<String, String> mappings = <String, String>{
+      'WEB_LOGICAL_KEY_CODE_MAP': webLogicalKeyCodeMap,
+      'WEB_PHYSICAL_KEY_CODE_MAP': webPhysicalKeyCodeMap,
+      'WEB_NUMPAD_CODE_MAP': webNumpadCodeMap,
+    };
+
+    final String template = File(path.join(flutterRoot.path, 'dev', 'tools', 'gen_keycodes', 'data', 'keyboard_map_web.tmpl')).readAsStringSync();
+    return _injectDictionary(template, mappings);
+  }
+
   /// The database of keys loaded from disk.
   final KeyData keyData;