Add |needs_resize_ack| flag to ViewMsg_Resize

content/browser/renderer_host/render_widget_host_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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 #define CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_
 
 #include <deque>
 #include <list>
 #include <map>
@@ skipping 546 matching lines @@
   // RenderViewHost overrides this method to report when in fullscreen mode.
   virtual bool IsFullscreen() const;
 
   // Indicates if the render widget host should track the render widget's size
   // as opposed to visa versa.
   void SetAutoResize(bool enable,
                      const gfx::Size& min_size,
                      const gfx::Size& max_size);
 
   // Fills in the |resize_params| struct.
-  void GetResizeParams(ViewMsg_Resize_Params* resize_params);
+  // Returns |false| if the update is redundant, |true| otherwise.
+  bool GetResizeParams(ViewMsg_Resize_Params* resize_params);
 
   // Sets the |resize_params| that were sent to the renderer bundled with the
   // request to create a new RenderWidget.
   void SetInitialRenderSizeParams(const ViewMsg_Resize_Params& resize_params);
 
   // Expose increment/decrement of the in-flight event count, so
   // RenderViewHostImpl can account for in-flight beforeunload/unload events.
   int increment_in_flight_event_count() { return ++in_flight_event_count_; }
   int decrement_in_flight_event_count() {
     DCHECK_GT(in_flight_event_count_, 0);
@@ skipping 282 matching lines @@
   bool is_focused_;
 
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_IMPL_H_