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

content/browser/renderer_host/render_widget_host_view_android.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_ANDROID_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_
 
 #include <map>
 #include <queue>
 
@@ skipping 131 matching lines @@
   virtual void ProcessAckedTouchEvent(const TouchEventWithLatencyInfo& touch,
                                       InputEventAckState ack_result) OVERRIDE;
   virtual void SetHasHorizontalScrollbar(
       bool has_horizontal_scrollbar) OVERRIDE;
   virtual void SetScrollOffsetPinning(
       bool is_pinned_to_left, bool is_pinned_to_right) OVERRIDE;
   virtual void UnhandledWheelEvent(
       const WebKit::WebMouseWheelEvent& event) OVERRIDE;
   virtual InputEventAckState FilterInputEvent(
       const WebKit::WebInputEvent& input_event) OVERRIDE;
+  virtual void GestureEventAck(int gesture_event_type,
+                               InputEventAckState ack_result) OVERRIDE;
   virtual void OnAccessibilityNotifications(
       const std::vector<AccessibilityHostMsg_NotificationParams>&
           params) OVERRIDE;
   virtual bool LockMouse() OVERRIDE;
   virtual void UnlockMouse() OVERRIDE;
   virtual void HasTouchEventHandlers(bool need_touch_events) OVERRIDE;
   virtual void OnSwapCompositorFrame(
       uint32 output_surface_id,
       scoped_ptr<cc::CompositorFrame> frame) OVERRIDE;
   virtual void OnOverscrolled(gfx::Vector2dF accumulated_overscroll,
@@ skipping 143 matching lines @@
   // Used to render overscroll overlays.
   bool overscroll_effect_enabled_;
   scoped_ptr<OverscrollGlow> overscroll_effect_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostViewAndroid);
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_ANDROID_H_