Add mouse input forwarding to gpu service

content/browser/renderer_host/input/input_router_impl.h

Index: content/browser/renderer_host/input/input_router_impl.h
diff --git a/content/browser/renderer_host/input/input_router_impl.h b/content/browser/renderer_host/input/input_router_impl.h
index 0f7b023bfd6fe3e7233a5bd23e43d3d33acf0cee..062dfe2134667f12091fc100755402e71b361096 100644
--- a/content/browser/renderer_host/input/input_router_impl.h
+++ b/content/browser/renderer_host/input/input_router_impl.h
@@ -127,6 +127,9 @@ private:
                        const ui::LatencyInfo& latency_info,
                        bool is_keyboard_shortcut);
 
+  void OfferToGpuService(const blink::WebInputEvent& input_event,
+                         bool is_keyboard_shortcut);
+
   // A data structure that attaches some metadata to a WebMouseWheelEvent
   // and its latency info.
   struct QueuedWheelEvent {