Work on separate browser contexts

ui/gfx/screen.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 UI_GFX_SCREEN_H_
 #define UI_GFX_SCREEN_H_
 
 #include "base/basictypes.h"
 #include "ui/base/ui_export.h"
 #include "ui/gfx/display.h"
@@ skipping 12 matching lines @@
   static Screen* GetScreenFor(NativeView view);
 
   // Returns the SCREEN_TYPE_NATIVE Screen. This should be used with caution,
   // as it is likely to be incorrect for code that runs on Windows.
   static Screen* GetNativeScreen();
 
   // Sets the global screen for a particular screen type. Only the _NATIVE
   // ScreenType must be provided.
   static void SetScreenInstance(ScreenType type, Screen* instance);
 
+  // Returns the global screen for a particular type. Types other than _NATIVE
+  // may be NULL.
+  static Screen* GetScreenByType(ScreenType type);
+
   // Sets the global ScreenTypeDelegate. May be left unset if the platform
   // uses only the _NATIVE ScreenType.
   static void SetScreenTypeDelegate(ScreenTypeDelegate* delegate);
 
   Screen();
   virtual ~Screen();
 
   // Returns true if DIP is enabled.
   virtual bool IsDIPEnabled() = 0;
 
@@ skipping 24 matching lines @@
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Screen);
 };
 
 Screen* CreateNativeScreen();
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SCREEN_H_