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 30a5d3eac45087bc0adba8df73c82720af7da65d..6c069683e62e2b813b10dd19ca95535d3efb970b 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();
+        }

[jdduke (slow), 2014/01/15 21:50:05]

I'm only worried about WebView behavior here.  Is it possible that WebView (via
ContentViewClient) would be interested in this? If so,  we might need to look
into how |mGestureStateListener.onUnhandledFlingStartEvent()| would interact
with the |onFlingStopped()| call.

     }
 
     @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);