Revert "Avoid vsync scheduling delay"

ci/licenses_golden/licenses_flutter

@@ -1643,7 +1643,6 @@ FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/platform/Platfor
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/platform/PlatformViewsController.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/platform/SingleViewPresentation.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/plugin/platform/VirtualDisplayController.java
-FILE: ../../../flutter/shell/platform/android/io/flutter/util/HandlerCompat.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/util/PathUtils.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/util/Preconditions.java
 FILE: ../../../flutter/shell/platform/android/io/flutter/util/Predicate.java

shell/platform/android/BUILD.gn

@@ -289,7 +289,6 @@ android_java_sources = [
   "io/flutter/plugin/platform/PlatformViewsController.java",
   "io/flutter/plugin/platform/SingleViewPresentation.java",
   "io/flutter/plugin/platform/VirtualDisplayController.java",
-  "io/flutter/util/HandlerCompat.java",
   "io/flutter/util/PathUtils.java",
   "io/flutter/util/Preconditions.java",
   "io/flutter/util/Predicate.java",

shell/platform/android/io/flutter/embedding/engine/dart/PlatformTaskQueue.java

@@ -7,13 +7,10 @@
 import android.os.Handler;
 import android.os.Looper;
 import androidx.annotation.NonNull;
-import io.flutter.util.HandlerCompat;
 
 /** A BinaryMessenger.TaskQueue that posts to the platform thread (aka main thread). */
 public class PlatformTaskQueue implements DartMessenger.DartMessengerTaskQueue {
-  // Use an async handler because the default is subject to vsync synchronization and can result
-  // in delays when dispatching tasks.
-  @NonNull private final Handler handler = HandlerCompat.createAsyncHandler(Looper.getMainLooper());
+  @NonNull private final Handler handler = new Handler(Looper.getMainLooper());
 
   @Override
   public void dispatch(@NonNull Runnable runnable) {

shell/platform/android/io/flutter/embedding/engine/loader/FlutterLoader.java

@@ -23,7 +23,6 @@
 import io.flutter.FlutterInjector;
 import io.flutter.Log;
 import io.flutter.embedding.engine.FlutterJNI;
-import io.flutter.util.HandlerCompat;
 import io.flutter.util.PathUtils;
 import io.flutter.util.TraceSection;
 import io.flutter.view.VsyncWaiter;
@@ -386,7 +385,7 @@ public void ensureInitializationCompleteAsync(
             Log.e(TAG, "Flutter initialization failed.", e);
             throw new RuntimeException(e);
           }
-          HandlerCompat.createAsyncHandler(Looper.getMainLooper())
+          new Handler(Looper.getMainLooper())
               .post(
                   () -> {
                     ensureInitializationComplete(applicationContext.getApplicationContext(), args);

tools/android_lint/project.xml

@@ -23,7 +23,6 @@
     <src file="../../../flutter/shell/platform/android/io/flutter/util/Predicate.java" />
     <src file="../../../flutter/shell/platform/android/io/flutter/util/TraceSection.java" />
     <src file="../../../flutter/shell/platform/android/io/flutter/util/PathUtils.java" />
-    <src file="../../../flutter/shell/platform/android/io/flutter/util/HandlerCompat.java" />
     <src file="../../../flutter/shell/platform/android/io/flutter/embedding/android/KeyboardMap.java" />
     <src file="../../../flutter/shell/platform/android/io/flutter/embedding/android/KeyboardManager.java" />
     <src file="../../../flutter/shell/platform/android/io/flutter/embedding/android/AndroidTouchProcessor.java" />