Let the browser know the end of fling

content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java

Index: content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
diff --git a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
index 5bd4ed79fe778231d725e699352fe3364bdfc25d..ec600bcf0724103c93a4fdf1c3555a1ac2e6ca5c 100644
--- a/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
+++ b/content/public/android/java/src/org/chromium/content/browser/ContentViewCore.java
@@ -1359,10 +1359,16 @@ public class ContentViewCore
 
     @SuppressWarnings("unused")
     @CalledByNative
-    private void unhandledFlingStartEvent() {
-        if (mGestureStateListener != null) {
+    private void onFlingStartEventAck(int ackResult) {
+        if (ackResult == ContentViewGestureHandler.INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS
+                && mGestureStateListener != null) {
             mGestureStateListener.onUnhandledFlingStartEvent();
         }
+        if (ackResult != ContentViewGestureHandler.INPUT_EVENT_ACK_STATE_CONSUMED) {
+            // No fling happened for the fling start event.
+            // Cancel the fling status set when sending GestureFlingStart.
+            getContentViewClient().onFlingStopped();
+        }
     }
 
     @SuppressWarnings("unused")
@@ -1428,6 +1434,7 @@ public class ContentViewCore
                 nativeScrollEnd(mNativeContentViewCore, timeMs);
                 return true;
             case ContentViewGestureHandler.GESTURE_FLING_START:
+                mContentViewClient.onFlingStarted();
                 nativeFlingStart(mNativeContentViewCore, timeMs, x, y,
                         b.getInt(ContentViewGestureHandler.VELOCITY_X, 0),
                         b.getInt(ContentViewGestureHandler.VELOCITY_Y, 0));
@@ -3257,6 +3264,11 @@ public class ContentViewCore
         return getContentViewClient().shouldBlockMediaRequest(url);
     }
 
+    @CalledByNative
+    private void onNativeFlingStopped() {
+        getContentViewClient().onFlingStopped();
+    }
+
     private native WebContents nativeGetWebContentsAndroid(long nativeContentViewCoreImpl);
 
     private native void nativeOnJavaContentViewCoreDestroyed(long nativeContentViewCoreImpl);