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

content/browser/renderer_host/render_widget_host_view_base.cc

 // 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.
 
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 
 #include "base/logging.h"
 #include "content/browser/accessibility/browser_accessibility_manager.h"
 #include "content/browser/renderer_host/basic_mouse_wheel_smooth_scroll_gesture.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
@@ skipping 409 matching lines @@
     const WebKit::WebMouseWheelEvent& event) {
   // Most implementations don't need to do anything here.
 }
 
 InputEventAckState RenderWidgetHostViewBase::FilterInputEvent(
     const WebKit::WebInputEvent& input_event) {
   // By default, input events are simply forwarded to the renderer.
   return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 }
 
-void RenderWidgetHostViewBase::GestureEventAck(int gesture_event_type) {
-}
+void RenderWidgetHostViewBase::GestureEventAck(int gesture_event_type,
+                                               InputEventAckState ack_result) {}
 
 void RenderWidgetHostViewBase::SetPopupType(WebKit::WebPopupType popup_type) {
   popup_type_ = popup_type;
 }
 
 WebKit::WebPopupType RenderWidgetHostViewBase::GetPopupType() {
   return popup_type_;
 }
 
 BrowserAccessibilityManager*
@@ skipping 84 matching lines @@
 
 uint32 RenderWidgetHostViewBase::RendererFrameNumber() {
   return renderer_frame_number_;
 }
 
 void RenderWidgetHostViewBase::DidReceiveRendererFrame() {
   ++renderer_frame_number_;
 }
 
 }  // namespace content