Gets component build to work with aura. As part of this I needed to

ui/gfx/screen.h

 // Copyright (c) 2011 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_
 #pragma once
 
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/rect.h"
 
 namespace gfx {
 
 // A utility class for getting various info about screen size, monitors,
 // cursor position, etc.
 // TODO(erikkay) add more of those methods here
 class UI_EXPORT Screen {
  public:
+  virtual ~Screen() {}
+
+#if defined(USE_AURA)
+  // Sets the instance to use. This takes owernship of |screen|, deleting the
+  // old instant. This is used on aura to avoid circular dependencies between ui

[Ben Goodger (Google), 2011/10/08 00:57:32]

instance

+  // and aura.
+  static void SetInstance(Screen* screen);
+#endif
+
   static gfx::Point GetCursorScreenPoint();
 
   // Returns the work area of the monitor nearest the specified window.
   static gfx::Rect GetMonitorWorkAreaNearestWindow(gfx::NativeView view);
 
   // Returns the bounds of the monitor nearest the specified window.
   static gfx::Rect GetMonitorAreaNearestWindow(gfx::NativeView view);
 
   // Returns the work area of the monitor nearest the specified point.
   static gfx::Rect GetMonitorWorkAreaNearestPoint(const gfx::Point& point);
 
   // Returns the monitor area (not the work area, but the complete bounds) of
   // the monitor nearest the specified point.
   static gfx::Rect GetMonitorAreaNearestPoint(const gfx::Point& point);
 
   // Returns the window under the cursor.
   static gfx::NativeWindow GetWindowAtCursorScreenPoint();
+
+ protected:
+  virtual gfx::Rect GetMonitorWorkAreaNearestWindowImpl(
+      gfx::NativeView view) = 0;
+  virtual gfx::Rect GetMonitorAreaNearestWindowImpl(
+      gfx::NativeView view) = 0;
+  virtual gfx::Rect GetMonitorWorkAreaNearestPointImpl(
+      const gfx::Point& point) = 0;
+  virtual gfx::Rect GetMonitorAreaNearestPointImpl(const gfx::Point& point) = 0;
+  virtual gfx::NativeWindow GetWindowAtCursorScreenPointImpl() = 0;
+
+private:
+#if defined(USE_AURA)
+  // The singleton screen instance. Only used on aura.
+  static Screen* instance_;
+#endif
 };
 
 }  // namespace gfx
 
 #endif  // VIEWS_SCREEN_H_