Make it possible for the scroll offset delegate to intercept fling.

content/browser/renderer_host/render_widget_host_view_aura.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_VIEW_AURA_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 204 matching lines @@
       const GpuHostMsg_AcceleratedSurfaceBuffersSwapped_Params& params_in_pixel,
       int gpu_host_id) OVERRIDE;
   virtual void AcceleratedSurfacePostSubBuffer(
       const GpuHostMsg_AcceleratedSurfacePostSubBuffer_Params& params_in_pixel,
       int gpu_host_id) OVERRIDE;
   virtual void AcceleratedSurfaceSuspend() OVERRIDE;
   virtual void AcceleratedSurfaceRelease() OVERRIDE;
   virtual bool HasAcceleratedSurface(const gfx::Size& desired_size) OVERRIDE;
   virtual void GetScreenInfo(WebKit::WebScreenInfo* results) OVERRIDE;
   virtual gfx::Rect GetBoundsInRootWindow() OVERRIDE;
-  virtual void GestureEventAck(int gesture_event_type) OVERRIDE;
+  virtual void GestureEventAck(int gesture_event_type,
+                               InputEventAckState ack_result) OVERRIDE;
   virtual void ProcessAckedTouchEvent(
       const TouchEventWithLatencyInfo& touch,
       InputEventAckState ack_result) OVERRIDE;
   virtual SmoothScrollGesture* CreateSmoothScrollGesture(
       bool scroll_down,
       int pixels_to_scroll,
       int mouse_event_x,
       int mouse_event_y) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
@@ skipping 457 matching lines @@
   TouchEditingClient* touch_editing_client_;
 
   ui::LatencyInfo software_latency_info_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAura);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_AURA_H_