Allow flavors and build types when using plugins (#71738)

dev/devicelab/bin/tasks/gradle_plugin_light_apk_test.dart

@@ -8,6 +8,7 @@ import 'package:flutter_devicelab/framework/apk_utils.dart';
 import 'package:flutter_devicelab/framework/framework.dart';
 import 'package:flutter_devicelab/framework/task_result.dart';
 import 'package:flutter_devicelab/framework/utils.dart';
+import 'package:path/path.dart' as path;
 
 Future<void> main() async {
   await task(() async {
@@ -207,6 +208,35 @@ Future<void> main() async {
         await project.runGradleTask('assembleLocal');
       });
 
+      await runProjectTest((FlutterProject project) async {
+        section('gradlew assembleLocal with plugin (custom debug build)');
+
+        final Directory tempDir = Directory.systemTemp.createTempSync('flutter_plugin.');
+        final Directory pluginDir = Directory(path.join(tempDir.path, 'plugin_under_test'));
+
+        section('Create plugin');
+        await inDirectory(tempDir, () async {
+          await flutter(
+            'create',
+            options: <String>[
+              '--org',
+              'io.flutter.devicelab.plugin',
+              '--template=plugin',
+              '--platforms=android,ios',
+              pluginDir.path,
+            ],
+          );
+        });
+
+        section('Configure');
+        project.addPlugin('plugin_under_test', value: '$platformLineSep    path: ${pluginDir.path}');
+        await project.addCustomBuildType('local', initWith: 'debug');
+        await project.getPackages();
+
+        section('Build APK');
+        await project.runGradleTask('assembleLocal');
+      });
+
       await runProjectTest((FlutterProject project) async {
         section('gradlew assembleBeta (custom release build)');
         await project.addCustomBuildType('beta', initWith: 'release');

dev/devicelab/lib/framework/apk_utils.dart

@@ -280,12 +280,15 @@ subprojects {
     ''');
   }
 
-  Future<void> addPlugin(String plugin) async {
+  /// Adds a plugin to the pubspec.
+  /// In pubspec, each dependency is expressed as key, value pair joined by a colon `:`.
+  /// such as `plugin_a`:`^0.0.1` or `plugin_a`:`\npath: /some/path`.
+  Future<void> addPlugin(String plugin, { String value = '' }) async {
     final File pubspec = File(path.join(rootPath, 'pubspec.yaml'));
     String content = await pubspec.readAsString();
     content = content.replaceFirst(
       '${platformLineSep}dependencies:$platformLineSep',
-      '${platformLineSep}dependencies:$platformLineSep  $plugin:$platformLineSep',
+      '${platformLineSep}dependencies:$platformLineSep  $plugin:$value$platformLineSep',
     );
     await pubspec.writeAsString(content, flush: true);
   }

packages/flutter_tools/gradle/flutter.gradle

@@ -149,19 +149,16 @@ class FlutterPlugin implements Plugin<Project> {
         String flutterExecutableName = Os.isFamily(Os.FAMILY_WINDOWS) ? "flutter.bat" : "flutter"
         flutterExecutable = Paths.get(flutterRoot.absolutePath, "bin", flutterExecutableName).toFile();
 
-        // Add custom build types.
+        String flutterProguardRules = Paths.get(flutterRoot.absolutePath, "packages", "flutter_tools",
+                "gradle", "flutter_proguard_rules.pro")
         project.android.buildTypes {
+            // Add profile build type.
             profile {
                 initWith debug
                 if (it.hasProperty("matchingFallbacks")) {
                     matchingFallbacks = ["debug", "release"]
                 }
             }
-        }
-
-        String flutterProguardRules = Paths.get(flutterRoot.absolutePath, "packages", "flutter_tools",
-                "gradle", "flutter_proguard_rules.pro")
-        project.android.buildTypes {
             release {
                 // Enables code shrinking, obfuscation, and optimization for only
                 // your project's release build type.
@@ -315,20 +312,19 @@ class FlutterPlugin implements Plugin<Project> {
             if (!supportsBuildMode(flutterBuildMode)) {
                 return
             }
-            addApiDependencies(
+            // Copy build types from the app to the plugin.
-                pluginProject,
+            // This allows to build apps with plugins and custom build types or flavors.
-                buildType.name,
+            pluginProject.android.buildTypes {
-                "io.flutter:flutter_embedding_$flutterBuildMode:$engineVersion"
+                "${buildType.name}" {}
-            )
+            }
+            pluginProject.dependencies.add(
+                "${buildType.name}CompileOnly",
+                "io.flutter:flutter_embedding_$flutterBuildMode:$engineVersion")
         }
+        // Wait until the Android plugin loaded.
         pluginProject.afterEvaluate {
-          pluginProject.android.buildTypes {
+            project.android.buildTypes.each addEmbeddingCompileOnlyDependency
-              profile {
+            project.android.buildTypes.whenObjectAdded addEmbeddingCompileOnlyDependency
-                  initWith debug
-              }
-          }
-          pluginProject.android.buildTypes.each addEmbeddingCompileOnlyDependency
-          pluginProject.android.buildTypes.whenObjectAdded addEmbeddingCompileOnlyDependency
         }
     }