Filter unnecessary GestureFlingCancel events.

content/browser/renderer_host/render_widget_host_impl.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 582 matching lines @@
   void ProcessTouchAck(WebKit::WebInputEvent::Type type, bool processed);
 
   // Called when there is a new auto resize (using a post to avoid a stack
   // which may get in recursive loops).
   void DelayedAutoResized();
 
   // Called periodically to advance the active scroll gesture after being
   // initiated by OnMsgBeginSmoothScroll.
   void TickActiveSmoothScrollGesture();
 
+  // Returns |true| if the given GestureFlingCancel should be discarded
+  // as unnecessary.
+  bool ShouldDiscardFlingCancelEvent(
+      const WebKit::WebGestureEvent& gesture_event);
+
   // Our delegate, which wants to know mainly about keyboard events.
   RenderWidgetHostDelegate* delegate_;
 
   // Created during construction but initialized during Init*(). Therefore, it
   // is guaranteed never to be NULL, but its channel may be NULL if the
   // renderer crashed, so you must always check that.
   RenderProcessHost* process_;
 
   // The ID of the corresponding object in the Renderer Instance.
   int routing_id_;
@@ skipping 157 matching lines @@
 
   // Keeps track of whether the webpage has any touch event handler. If it does,
   // then touch events are sent to the renderer. Otherwise, the touch events are
   // not sent to the renderer.
   bool has_touch_handler_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   scoped_ptr<TapSuppressionController> tap_suppression_controller_;
 
+  bool fling_in_progress_;
+
   scoped_ptr<SmoothScrollGesture> active_smooth_scroll_gesture_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_