Implementation of device metrics emulation in render view.

content/renderer/external_popup_menu.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_EXTERNAL_POPUP_MENU_H_
 #define CONTENT_RENDERER_EXTERNAL_POPUP_MENU_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "third_party/WebKit/public/web/WebExternalPopupMenu.h"
 #include "third_party/WebKit/public/web/WebPopupMenuInfo.h"
+#include "ui/gfx/point.h"
 
 namespace WebKit {
 class WebExternalPopupMenuClient;
 }
 
 namespace content {
 class RenderViewImpl;
 
 class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
  public:
   ExternalPopupMenu(RenderViewImpl* render_view,
                     const WebKit::WebPopupMenuInfo& popup_menu_info,
                     WebKit::WebExternalPopupMenuClient* popup_menu_client);
 
   virtual ~ExternalPopupMenu() {}
 
+  void SetOriginScaleForEmulation(float scale);
+
 #if defined(OS_MACOSX)
   // Called when the user has selected an item. |selected_item| is -1 if the
   // user canceled the popup.
   void DidSelectItem(int selected_index);
 #endif
 
 #if defined(OS_ANDROID)
   // Called when the user has selected items or canceled the popup.
   void DidSelectItems(bool canceled, const std::vector<int>& selected_indices);
 #endif
 
   // WebKit::WebExternalPopupMenu implementation:
   virtual void show(const WebKit::WebRect& bounds);
   virtual void close();
 
  private:
   RenderViewImpl* render_view_;
   WebKit::WebPopupMenuInfo popup_menu_info_;
   WebKit::WebExternalPopupMenuClient* popup_menu_client_;
 
+  // Popups may be displaced when screen metrics emulation is enabled.
+  // This scale is used to properly adjust popup position.
+  float origin_scale_for_emulation_;
+
   DISALLOW_COPY_AND_ASSIGN(ExternalPopupMenu);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_EXTERNAL_POPUP_MENU_H_