Respect the order of input messages from browser to renderer

content/renderer/render_view_impl.h

 // Copyright (c) 2012 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_RENDERER_RENDER_VIEW_IMPL_H_
 #define CONTENT_RENDERER_RENDER_VIEW_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 427 matching lines @@
   SSLStatus GetSSLStatusOfFrame(blink::WebFrame* frame) const override;
   const std::string& GetAcceptLanguages() const override;
 #if defined(OS_ANDROID)
   void UpdateTopControlsState(TopControlsState constraints,
                               TopControlsState current,
                               bool animate) override;
 #endif
   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);
 
   bool uses_temporary_zoom_level() const { return uses_temporary_zoom_level_; }
 
   // Please do not add your stuff randomly to the end here. If there is an
   // appropriate section, add it there. If not, there are some random functions
   // nearer to the top you can add it to.
 
  protected:
@@ skipping 499 matching lines @@
   // session, this info is sent to the browser along with other drag/drop info.
   DragEventSourceInfo possible_drag_event_info_;
 
   // NOTE: stats_collection_observer_ should be the last members because their
   // constructors call the AddObservers method of RenderViewImpl.
   std::unique_ptr<StatsCollectionObserver> stats_collection_observer_;
 
   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
   // bunch of stuff, you should probably create a helper class and put your
   // data and methods on that to avoid bloating RenderView more.  You can
   // use the Observer interface to filter IPC messages and receive frame change
   // notifications.
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(RenderViewImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_RENDER_VIEW_IMPL_H_