Implementation of device metrics emulation in render view.

content/renderer/external_popup_menu.h

Index: content/renderer/external_popup_menu.h
diff --git a/content/renderer/external_popup_menu.h b/content/renderer/external_popup_menu.h
index 729205fba9f8f971109c251145c2048342cacf54..28d65acbdc2a70bd505f79e5152c7c6b343b90bf 100644
--- a/content/renderer/external_popup_menu.h
+++ b/content/renderer/external_popup_menu.h
@@ -10,6 +10,7 @@
 #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;
@@ -26,6 +27,8 @@ class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
 
   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.
@@ -46,6 +49,10 @@ class ExternalPopupMenu : public WebKit::WebExternalPopupMenu {
   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);
 };