[Impeller] delete Impeller sim opt out. (flutter/engine#56706)

Impeller only on simulators.

engine/src/flutter/common/settings.h

@@ -226,10 +226,10 @@ struct Settings {
 #if FML_OS_ANDROID || FML_OS_IOS || FML_OS_IOS_SIMULATOR
   // On iOS devices, Impeller is the default with no opt-out and this field is
   // const.
-#if FML_OS_IOS && !FML_OS_IOS_SIMULATOR
+#if FML_OS_IOS || FML_OS_IOS_SIMULATOR
   static constexpr const
-#endif  // FML_OS_IOS && !FML_OS_IOS_SIMULATOR
+#endif                              // FML_OS_IOS && !FML_OS_IOS_SIMULATOR
-      bool enable_impeller = true;
+      bool enable_impeller = true;  // NOLINT(readability-identifier-naming)
 #else
   bool enable_impeller = false;
 #endif

engine/src/flutter/shell/common/switches.cc

@@ -443,7 +443,7 @@ Settings SettingsFromCommandLine(const fml::CommandLine& command_line) {
   settings.use_asset_fonts =
       !command_line.HasOption(FlagForSwitch(Switch::DisableAssetFonts));
 
-#if FML_OS_IOS && !FML_OS_IOS_SIMULATOR
+#if FML_OS_IOS || FML_OS_IOS_SIMULATOR
 // On these configurations, the Impeller flags are completely ignored with the
 // default taking hold.
 #else   // FML_OS_IOS && !FML_OS_IOS_SIMULATOR

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterDartProject.mm

@@ -177,21 +177,6 @@ flutter::Settings FLTDefaultSettingsForBundle(NSBundle* bundle, NSProcessInfo* p
   settings.enable_wide_gamut = enableWideGamut;
 #endif
 
-#if FML_OS_IOS_SIMULATOR
-  if (!command_line.HasOption("enable-impeller")) {
-    // Next, look in the app bundle.
-    NSNumber* enableImpeller = [bundle objectForInfoDictionaryKey:@"FLTEnableImpeller"];
-    if (enableImpeller == nil) {
-      // If it isn't in the app bundle, look in the main bundle.
-      enableImpeller = [mainBundle objectForInfoDictionaryKey:@"FLTEnableImpeller"];
-    }
-    // Change the default only if the option is present.
-    if (enableImpeller != nil) {
-      settings.enable_impeller = enableImpeller.boolValue;
-    }
-  }
-#endif  // FML_OS_IOS_SIMULATOR
-
   settings.warn_on_impeller_opt_out = true;
 
   NSNumber* enableTraceSystrace = [mainBundle objectForInfoDictionaryKey:@"FLTTraceSystrace"];

engine/src/flutter/shell/platform/darwin/ios/framework/Source/FlutterDartProjectTest.mm

@@ -225,16 +225,6 @@ FLUTTER_ASSERT_ARC
   }
 }
 
-- (void)testDisableImpellerSettingIsCorrectlyParsed {
-  id mockMainBundle = OCMPartialMock([NSBundle mainBundle]);
-  OCMStub([mockMainBundle objectForInfoDictionaryKey:@"FLTEnableImpeller"]).andReturn(@"NO");
-
-  auto settings = FLTDefaultSettingsForBundle();
-  // Check settings.enable_impeller value is same as the value defined in Info.plist.
-  XCTAssertEqual(settings.enable_impeller, NO);
-  [mockMainBundle stopMocking];
-}
-
 - (void)testRequestsWarningWhenImpellerOptOut {
   auto settings = FLTDefaultSettingsForBundle();
   XCTAssertEqual(settings.warn_on_impeller_opt_out, YES);
@@ -277,49 +267,6 @@ FLUTTER_ASSERT_ARC
   [mockMainBundle stopMocking];
 }
 
-- (void)testDisableImpellerSettingIsCorrectlyOverriddenByCommandLine {
-  id mockMainBundle = OCMPartialMock([NSBundle mainBundle]);
-  OCMStub([mockMainBundle objectForInfoDictionaryKey:@"FLTEnableImpeller"]).andReturn(@"YES");
-  id mockProcessInfo = OCMPartialMock([NSProcessInfo processInfo]);
-  NSArray* arguments = @[ @"process_name", @"--enable-impeller=false" ];
-  OCMStub([mockProcessInfo arguments]).andReturn(arguments);
-
-  auto settings = FLTDefaultSettingsForBundle(nil, mockProcessInfo);
-  // Check settings.enable_impeller value is same as the value on command line.
-  XCTAssertEqual(settings.enable_impeller, NO);
-  [mockMainBundle stopMocking];
-}
-
-- (void)testDisableImpellerAppBundleSettingIsCorrectlyParsed {
-  NSString* bundleId = [FlutterDartProject defaultBundleIdentifier];
-  id mockAppBundle = OCMClassMock([NSBundle class]);
-  OCMStub([mockAppBundle objectForInfoDictionaryKey:@"FLTEnableImpeller"]).andReturn(@"NO");
-  OCMStub([mockAppBundle bundleWithIdentifier:bundleId]).andReturn(mockAppBundle);
-
-  auto settings = FLTDefaultSettingsForBundle();
-  // Check settings.enable_impeller value is same as the value defined in Info.plist.
-  XCTAssertEqual(settings.enable_impeller, NO);
-
-  [mockAppBundle stopMocking];
-}
-
-- (void)testEnableImpellerAppBundleSettingIsCorrectlyParsed {
-  NSString* bundleId = [FlutterDartProject defaultBundleIdentifier];
-  id mockAppBundle = OCMClassMock([NSBundle class]);
-  OCMStub([mockAppBundle objectForInfoDictionaryKey:@"FLTEnableImpeller"]).andReturn(@"YES");
-  OCMStub([mockAppBundle bundleWithIdentifier:bundleId]).andReturn(mockAppBundle);
-
-  // Since FLTEnableImpeller is set to false in the main bundle, this is also
-  // testing that setting FLTEnableImpeller in the app bundle takes
-  // precedence over setting it in the root bundle.
-
-  auto settings = FLTDefaultSettingsForBundle();
-  // Check settings.enable_impeller value is same as the value defined in Info.plist.
-  XCTAssertEqual(settings.enable_impeller, YES);
-
-  [mockAppBundle stopMocking];
-}
-
 - (void)testEnableTraceSystraceSettingIsCorrectlyParsed {
   NSBundle* mainBundle = [NSBundle mainBundle];
   NSNumber* enableTraceSystrace = [mainBundle objectForInfoDictionaryKey:@"FLTTraceSystrace"];

engine/src/flutter/testing/scenario_app/bin/run_ios_tests.dart

@@ -64,7 +64,6 @@ void main(List<String> args) async {
       osRuntime: results.option('os-runtime')!,
       osVersion: results.option('os-version')!,
       withImpeller: results.flag('with-impeller'),
-      withSkia: results.flag('with-skia'),
       dumpXcresultOnFailure: dumpXcresultOnFailurePath,
     );
     completer.complete();
@@ -110,7 +109,6 @@ Future<void> _run(
   required String osRuntime,
   required String osVersion,
   required bool withImpeller,
-  required bool withSkia,
   required String? dumpXcresultOnFailure,
 }) async {
   // Terminate early on SIGINT.
@@ -135,45 +133,6 @@ Future<void> _run(
 
   cleanup.add(() => _deleteIfPresent(resultBundle));
 
-  if (withSkia) {
-    io.stderr.writeln('Running simulator tests with Skia');
-    io.stderr.writeln();
-    final process = await _runTests(
-      outScenariosPath: scenarioPath,
-      resultBundlePath: resultBundle.path,
-      osVersion: osVersion,
-      deviceName: deviceName,
-      iosEngineVariant: iosEngineVariant,
-      xcodeBuildExtraArgs: [
-        // Plist with `FTEEnableImpeller=NO`; all projects in the workspace require this file.
-        // For example, `FlutterAppExtensionTestHost` has a dummy file under the below directory.
-        r'INFOPLIST_FILE=$(TARGET_NAME)/Info_Skia.plist',
-      ],
-    );
-    cleanup.add(process.kill);
-
-    // Create a temporary directory, if needed.
-    var storePath = dumpXcresultOnFailure;
-    if (storePath == null) {
-      final dumpDir = io.Directory.systemTemp.createTempSync();
-      storePath = dumpDir.path;
-      cleanup.add(() => dumpDir.delete(recursive: true));
-    }
-
-    if (await process.exitCode != 0) {
-      final String outputPath = _zipAndStoreFailedTestResults(
-        iosEngineVariant: iosEngineVariant,
-        resultBundle: resultBundle,
-        storePath: storePath,
-      );
-      io.stderr.writeln('Failed test results are stored at $outputPath');
-      throw _ToolFailure('test failed.');
-    } else {
-      io.stderr.writeln('test succcess.');
-    }
-    _deleteIfPresent(resultBundle);
-  }
-
   if (withImpeller) {
     final process = await _runTests(
       outScenariosPath: scenarioPath,
@@ -247,15 +206,7 @@ final _args = ArgParser()
   )
   ..addFlag(
     'with-impeller',
-    help: 'Whether to use the Impeller backend to run the tests.\n\nCan be '
+    help: 'Whether to use the Impeller backend to run the tests.',
-        'combined with --with-skia to run the test suite with both backends.',
-    defaultsTo: true,
-  )
-  ..addFlag(
-    'with-skia',
-    help:
-        'Whether to use the Skia backend to run the tests.\n\nCan be combined '
-        'with --with-impeller to run the test suite with both backends.',
     defaultsTo: true,
   )
   ..addOption(