Allow MainThreadEventQueue to call the RenderWidget directly.

content/renderer/render_view_impl.h

Index: content/renderer/render_view_impl.h
diff --git a/content/renderer/render_view_impl.h b/content/renderer/render_view_impl.h
index 508791e77514011c04a88ffed1fb040a819d540d..ed261d1a80f31677d63771f3202698e763bde3f6 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -93,6 +93,7 @@ class ICCProfile;
 
 namespace content {
 
+class IdleUserDetector;
 class RendererDateTimePicker;
 class RenderViewImplTest;
 class RenderViewObserver;
@@ -381,6 +382,11 @@ class CONTENT_EXPORT RenderViewImpl
     return weak_ptr_factory_.GetWeakPtr();
   }
 
+  InputEventAckState HandleInputEvent(
+      const blink::WebCoalescedInputEvent& input_event,
+      const ui::LatencyInfo& latency_info,
+      InputEventDispatchType dispatch_type) override;
+
  protected:
   // RenderWidget overrides:
   blink::WebWidget* GetWebWidget() const override;
@@ -811,6 +817,8 @@ class CONTENT_EXPORT RenderViewImpl
   typedef std::map<cc::SharedBitmapId, cc::SharedBitmap*> BitmapMap;
   BitmapMap disambiguation_bitmaps_;
 
+  std::unique_ptr<IdleUserDetector> idle_user_detector_;
+
   // ---------------------------------------------------------------------------
   // ADDING NEW DATA? Please see if it fits appropriately in one of the above
   // sections rather than throwing it randomly at the end. If you're adding a