Enable track widget creation on by default (#43471)

packages/flutter_tools/lib/src/compile.dart

@@ -514,7 +514,7 @@ class DefaultResidentCompiler implements ResidentCompiler {
     String sdkRoot, {
     @required this.buildMode,
     this.causalAsyncStacks = true,
-    this.trackWidgetCreation = false,
+    this.trackWidgetCreation = true,
     this.packagesPath,
     this.fileSystemRoots,
     this.fileSystemScheme,

packages/flutter_tools/lib/src/runner/flutter_command.dart

@@ -361,7 +361,7 @@ abstract class FlutterCommand extends Command<void> {
     argParser.addFlag(
       'track-widget-creation',
       hide: !hasEffect && !verboseHelp,
-      defaultsTo: false, // this will soon be changed to true
+      defaultsTo: true,
       help: 'Track widget creation locations. This enables features such as the widget inspector. '
             'This parameter is only functional in debug mode (i.e. when compiling JIT, not AOT).',
     );

packages/flutter_tools/test/commands.shard/permeable/test_test.dart

@@ -62,7 +62,8 @@ void main() {
 
     testUsingContext('report which user created widget caused the error - no flag', () async {
       Cache.flutterRoot = '../..';
-      return _testFile('print_user_created_ancestor_no_flag', automatedTestsDirectory, flutterTestDirectory);
+      return _testFile('print_user_created_ancestor_no_flag', automatedTestsDirectory, flutterTestDirectory,
+         extraArguments: const <String>['--no-track-widget-creation']);
     }, skip: io.Platform.isWindows); // TODO(chunhtai): Dart on Windows has trouble with unicode characters in output (#35425).
 
     testUsingContext('report correct created widget caused the error', () async {

packages/flutter_tools/test/general.shard/commands/build_apk_test.dart

@@ -209,7 +209,7 @@ flutter:
           gradlew,
           '-q',
           '-Ptarget=${fs.path.join(tempDir.path, 'flutter_project', 'lib', 'main.dart')}',
-          '-Ptrack-widget-creation=false',
+          '-Ptrack-widget-creation=true',
           '-Pshrink=true',
           '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleRelease',
@@ -241,7 +241,7 @@ flutter:
           gradlew,
           '-q',
           '-Ptarget=${fs.path.join(tempDir.path, 'flutter_project', 'lib', 'main.dart')}',
-          '-Ptrack-widget-creation=false',
+          '-Ptrack-widget-creation=true',
           '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleRelease',
         ],
@@ -265,7 +265,7 @@ flutter:
           gradlew,
           '-q',
           '-Ptarget=${fs.path.join(tempDir.path, 'flutter_project', 'lib', 'main.dart')}',
-          '-Ptrack-widget-creation=false',
+          '-Ptrack-widget-creation=true',
           '-Pshrink=true',
           '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleRelease',
@@ -321,7 +321,7 @@ flutter:
           gradlew,
           '-q',
           '-Ptarget=${fs.path.join(tempDir.path, 'flutter_project', 'lib', 'main.dart')}',
-          '-Ptrack-widget-creation=false',
+          '-Ptrack-widget-creation=true',
           '-Pshrink=true',
           '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleRelease',
@@ -374,7 +374,7 @@ flutter:
           gradlew,
           '-q',
           '-Ptarget=${fs.path.join(tempDir.path, 'flutter_project', 'lib', 'main.dart')}',
-          '-Ptrack-widget-creation=false',
+          '-Ptrack-widget-creation=true',
           '-Pshrink=true',
           '-Ptarget-platform=android-arm,android-arm64,android-x64',
           'assembleRelease',