Add gestureFlingStart to gestures that can cancel a deferred tapDown

It looks like there are cases where we might get a tapDown followed by a flingStart
immediately without and scrollBegin from the Android framework. To avoid using the
tapDown in these situations have flingStart also remove the deferred tapDown like
scrollBegin and pinchBegin

BUG=135818


Review URL: https://chromiumcodereview.appspot.com/11418218

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@170583 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/gesture_event_filter.cc

@@ -136,10 +136,6 @@ bool GestureEventFilter::ShouldForwardForTapDeferral(
         return ShouldHandleEventNow();
       }
       return false;
-    case WebInputEvent::GestureFlingStart:
-      fling_in_progress_ = true;
-      coalesced_gesture_events_.push_back(gesture_event);
-      return ShouldHandleEventNow();
     case WebInputEvent::GestureTapDown:
       // GestureTapDown is always paired with either a Tap, DoubleTap, LongPress
       // or TapCancel, so it should be impossible to have more than one
@@ -177,6 +173,8 @@ bool GestureEventFilter::ShouldForwardForTapDeferral(
       }
       coalesced_gesture_events_.push_back(gesture_event);
       return ShouldHandleEventNow();
+    case WebInputEvent::GestureFlingStart:
+      fling_in_progress_ = true;
     case WebInputEvent::GestureScrollBegin:
     case WebInputEvent::GesturePinchBegin:
       send_gtd_timer_.Stop();