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

content/browser/renderer_host/render_widget_host_impl.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_impl.h"
 
 #include <math.h>
 #include <utility>
 
 #include "base/auto_reset.h"
@@ skipping 2083 matching lines @@
 }
 
 void RenderWidgetHostImpl::OnGestureEventAck(
     const WebKit::WebGestureEvent& event,
     InputEventAckState ack_result) {
   const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
   if (overscroll_controller_)
     overscroll_controller_->ReceivedEventACK(event, processed);
 
   if (view_)
-    view_->GestureEventAck(event.type);
+    view_->GestureEventAck(event.type, ack_result);
 }
 
 void RenderWidgetHostImpl::OnTouchEventAck(
     const TouchEventWithLatencyInfo& event,
     InputEventAckState ack_result) {
   ComputeTouchLatency(event.latency);
   if (view_)
     view_->ProcessAckedTouchEvent(event, ack_result);
 }
 
@@ skipping 353 matching lines @@
     int process_id = (b->first.second >> 32) & 0xffffffff;
     RenderWidgetHost* rwh =
         RenderWidgetHost::FromID(process_id, routing_id);
     if (!rwh)
       continue;
     RenderWidgetHostImpl::From(rwh)->FrameSwapped(latency_info);
   }
 }
 
 }  // namespace content