Animated scroll shouldn't consume unhandled scrolls for OOPIFs.

content/browser/renderer_host/input/input_router_client.h

 // Copyright 2013 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_INPUT_INPUT_ROUTER_CLIENT_H_
 #define CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_
 
 #include "content/browser/renderer_host/event_with_latency_info.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_source.h"
@@ skipping 42 matching lines @@
 
   // Called when a renderer fling has terminated.
   virtual void DidStopFlinging() = 0;
 
   // Called when the input router generates an event. It is intended that the
   // client will do some processing on |gesture_event| and then send it back
   // to the InputRouter via SendGestureEvent.
   virtual void ForwardGestureEventWithLatencyInfo(
       const blink::WebGestureEvent& gesture_event,
       const ui::LatencyInfo& latency_info) = 0;
+
+  virtual bool is_in_gesture_scroll(blink::WebGestureDevice device) = 0;
 };
 
 } // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_INPUT_ROUTER_CLIENT_H_