Add an "isInsideVSync" check.

android_webview/java/src/org/chromium/android_webview/AwContents.java

Index: android_webview/java/src/org/chromium/android_webview/AwContents.java
diff --git a/android_webview/java/src/org/chromium/android_webview/AwContents.java b/android_webview/java/src/org/chromium/android_webview/AwContents.java
index 8338559035220c8762571e0d4a9627c13eeb1464..e556de8b69aa1aa0cc81032fccebf929b901988f 100644
--- a/android_webview/java/src/org/chromium/android_webview/AwContents.java
+++ b/android_webview/java/src/org/chromium/android_webview/AwContents.java
@@ -181,6 +181,7 @@ public class AwContents {
     private final AwLayoutChangeListener mLayoutChangeListener;
     private final Context mContext;
     private ContentViewCore mContentViewCore;
+    private WindowAndroid mWindowAndroid;
     private final AwContentsClient mContentsClient;
     private final AwContentViewClient mContentViewClient;
     private WebContentsObserverAndroid mWebContentsObserver;
@@ -614,12 +615,11 @@ public class AwContents {
             Context context, InternalAccessDelegate internalDispatcher, long nativeWebContents,
             GestureStateListener gestureStateListener,
             ContentViewClient contentViewClient,
-            ContentViewCore.ZoomControlsDelegate zoomControlsDelegate) {
+            ContentViewCore.ZoomControlsDelegate zoomControlsDelegate,
+            WindowAndroid windowAndroid) {
         ContentViewCore contentViewCore = new ContentViewCore(context);
         contentViewCore.initialize(containerView, internalDispatcher, nativeWebContents,
-                context instanceof Activity ?
-                        new ActivityWindowAndroid((Activity) context) :
-                        new WindowAndroid(context.getApplicationContext()));
+                windowAndroid);
         contentViewCore.addGestureStateListener(gestureStateListener);
         contentViewCore.setContentViewClient(contentViewClient);
         contentViewCore.setZoomControlsDelegate(zoomControlsDelegate);
@@ -755,9 +755,13 @@ public class AwContents {
         mCleanupReference = new CleanupReference(this, new DestroyRunnable(mNativeAwContents));
 
         long nativeWebContents = nativeGetWebContents(mNativeAwContents);
+
+        mWindowAndroid = mContext instanceof Activity ?
+                new ActivityWindowAndroid((Activity) mContext) :
+                new WindowAndroid(mContext.getApplicationContext());
         mContentViewCore = createAndInitializeContentViewCore(
                 mContainerView, mContext, mInternalAccessAdapter, nativeWebContents,
-                new AwGestureStateListener(), mContentViewClient, mZoomControls);
+                new AwGestureStateListener(), mContentViewClient, mZoomControls, mWindowAndroid);
         nativeSetJavaPeers(mNativeAwContents, this, mWebContentsDelegate, mContentsClientBridge,
                 mIoThreadClient, mInterceptNavigationDelegate);
         installWebContentsObserver();
@@ -2039,10 +2043,10 @@ public class AwContents {
 
     @CalledByNative
     private void postInvalidateOnAnimation() {
-        if (SUPPORTS_ON_ANIMATION) {
+        if (SUPPORTS_ON_ANIMATION && !mWindowAndroid.isInsideVSync()) {
             mContainerView.postInvalidateOnAnimation();
         } else {
-            mContainerView.postInvalidate();
+            mContainerView.invalidate();
         }
     }