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

content/browser/renderer_host/render_widget_host_view_android.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_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 846 matching lines @@
 void RenderWidgetHostViewAndroid::SetScrollOffsetPinning(
     bool is_pinned_to_left, bool is_pinned_to_right) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
 void RenderWidgetHostViewAndroid::UnhandledWheelEvent(
     const WebKit::WebMouseWheelEvent& event) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
+void RenderWidgetHostViewAndroid::GestureEventAck(
+    int gesture_event_type,
+    InputEventAckState ack_result) {
+  if (gesture_event_type == WebKit::WebInputEvent::GestureFlingStart &&
+      ack_result == INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS) {
+    content_view_core_->UnhandledFlingStartEvent();
+  }
+}
+
 InputEventAckState RenderWidgetHostViewAndroid::FilterInputEvent(
     const WebKit::WebInputEvent& input_event) {
   if (host_) {
     SynchronousCompositorImpl* compositor =
         SynchronousCompositorImpl::FromID(host_->GetProcess()->GetID(),
                                           host_->GetRoutingID());
     if (compositor)
       return compositor->HandleInputEvent(input_event);
   }
   return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
@@ skipping 257 matching lines @@
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content