Respect the order of input messages from browser to renderer

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 e60e4c330c28308aeed9c25e79a9d1caf741917b..2d4f6f49a1d209ce0b37f018aecb08872d0bac8a 100644
--- a/content/renderer/render_view_impl.h
+++ b/content/renderer/render_view_impl.h
@@ -433,6 +433,7 @@ class CONTENT_EXPORT RenderViewImpl
   void ConvertViewportToWindowViaWidget(blink::WebRect* rect) override;
   gfx::RectF ElementBoundsInWindow(const blink::WebElement& element) override;
   float GetDeviceScaleFactorForTest() const override;
+  bool HasAddedInputHandler() const override;
 
   gfx::Point ConvertWindowPointToViewport(const gfx::Point& point);
 
@@ -934,6 +935,8 @@ class CONTENT_EXPORT RenderViewImpl
   typedef std::map<cc::SharedBitmapId, cc::SharedBitmap*> BitmapMap;
   BitmapMap disambiguation_bitmaps_;
 
+  bool has_added_input_handler_;
+
   // ---------------------------------------------------------------------------
   // 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