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

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"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
+#include "ui/gfx/screen_type_delegate.h"
 
 namespace gfx {
 class Rect;
 class ScreenImpl;
 
 // A utility class for getting various info about screen size, displays,
 // cursor position, etc.
 class UI_EXPORT Screen {
  public:
 #if defined(USE_AURA)
-  // Sets the instance to use. This takes owernship of |screen|, deleting the
-  // old instance. This is used on aura to avoid circular dependencies between
-  // ui and aura.
-  static void SetInstance(ScreenImpl* screen);
+  // This is used on aura to avoid circular dependencies between ui and aura.
+  static void SetInstance(ScreenType type, ScreenImpl* screen);
+  // TODO(scottmg): http://crbug.com/133312
+  static void SetScreenTypeDelegate(ScreenTypeDelegate* delegate);
+  static void ForceScreenTypeOverride(ScreenType type);
 #endif
 
   // Returns true if DIP is enabled.
   static bool IsDIPEnabled();
 
   // Returns the current absolute position of the mouse pointer.
-  static gfx::Point GetCursorScreenPoint();
+  static gfx::Point GetCursorScreenPoint(NativeView context);
 
   // Returns the window under the cursor.
-  static gfx::NativeWindow GetWindowAtCursorScreenPoint();
+  static gfx::NativeWindow GetWindowAtCursorScreenPoint(
+      NativeView context);
 
   // Returns the number of displays.
   // Mirrored displays are excluded; this method is intended to return the
   // number of distinct, usable displays.
-  static int GetNumDisplays();
+  static int GetNumDisplays(NativeView context);
 
   // Returns the display nearest the specified window.
-  static gfx::Display GetDisplayNearestWindow(gfx::NativeView view);
+  static gfx::Display GetDisplayNearestWindow(NativeView view);
 
   // Returns the the display nearest the specified point.
-  static gfx::Display GetDisplayNearestPoint(const gfx::Point& point);
+  static gfx::Display GetDisplayNearestPoint(
+      NativeView context, const gfx::Point& point);
 
   // Returns the display that most closely intersects the provided bounds.
-  static gfx::Display GetDisplayMatching(const gfx::Rect& match_rect);
+  static gfx::Display GetDisplayMatching(
+      NativeView context, const gfx::Rect& match_rect);
 
   // Returns the primary display.
-  static gfx::Display GetPrimaryDisplay();
+  static gfx::Display GetPrimaryDisplay(NativeView context);
+
+  static gfx::NativeView BadTwoWorldsContext();
 
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(Screen);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_SCREEN_H_