Animated scroll shouldn't consume unhandled scrolls for OOPIFs.

content/browser/renderer_host/input/input_router_client.h

Index: content/browser/renderer_host/input/input_router_client.h
diff --git a/content/browser/renderer_host/input/input_router_client.h b/content/browser/renderer_host/input/input_router_client.h
index 0221533738205bce9c75dabe055cdb781266cdb7..394eb4d1d0e33fe5fad540e663e5935fd40a5b0d 100644
--- a/content/browser/renderer_host/input/input_router_client.h
+++ b/content/browser/renderer_host/input/input_router_client.h
@@ -60,6 +60,8 @@ class CONTENT_EXPORT InputRouterClient {
   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