Add context to gfx::Screen calls in support of simultaneous desktop+ash

ash/keyboard_overlay/keyboard_overlay_delegate.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 ASH_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_DELEGATE_H_
 #define ASH_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_DELEGATE_H_
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "googleurl/src/gurl.h"
 #include "ui/web_dialogs/web_dialog_delegate.h"
 
 namespace views {
 class WebDialogView;
 }
 
+namespace ash {
+
 class KeyboardOverlayDelegate : public ui::WebDialogDelegate {
  public:
   KeyboardOverlayDelegate(const string16& title, const GURL& url);
 
   void Show(views::WebDialogView* view);
 
   // Overridden from ui::WebDialogDelegate:
   virtual void GetDialogSize(gfx::Size* size) const OVERRIDE;
 
  private:
@@ skipping 19 matching lines @@
   // The URL of the keyboard overlay.
   GURL url_;
 
   // The view associated with this delegate.
   // This class does not own the pointer.
   views::WebDialogView* view_;
 
   DISALLOW_COPY_AND_ASSIGN(KeyboardOverlayDelegate);
 };
 
+}  // namespace ash
+
 #endif  // ASH_KEYBOARD_OVERLAY_KEYBOARD_OVERLAY_DELEGATE_H_