Refactor screen/monitor so that gfx::Screen returns monitor object.

ui/aura/test/test_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_AURA_TEST_TEST_SCREEN_H_
 #define UI_AURA_TEST_TEST_SCREEN_H_
 #pragma once
 
 #include "base/compiler_specific.h"
+#include "base/memory/scoped_ptr.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/screen.h"
 
+namespace gfx {
+class Monitor;
+}
+
 namespace aura {
 class RootWindow;
+class MonitorAura;
 
 // A minimal, testing Aura implementation of gfx::Screen.
-class TestScreen : public gfx::Screen {
+class TestScreen : public gfx::ScreenImpl {
  public:
   explicit TestScreen(aura::RootWindow* root_window);
   virtual ~TestScreen();
 
  protected:
-  virtual gfx::Point GetCursorScreenPointImpl() OVERRIDE;
-  virtual gfx::Rect GetMonitorWorkAreaNearestWindowImpl(
+  // gfx::ScreenImpl overrides:
+  virtual gfx::Point GetCursorScreenPoint() OVERRIDE;
+  virtual gfx::NativeWindow GetWindowAtCursorScreenPoint() OVERRIDE;
+  virtual int GetNumMonitors() OVERRIDE;
+  virtual const gfx::Monitor* GetMonitorNearestWindow(
       gfx::NativeView view) OVERRIDE;
-  virtual gfx::Rect GetMonitorAreaNearestWindowImpl(
-      gfx::NativeView view) OVERRIDE;
-  virtual gfx::Rect GetMonitorWorkAreaNearestPointImpl(
+  virtual const gfx::Monitor* GetMonitorNearestPoint(
       const gfx::Point& point) OVERRIDE;
-  virtual gfx::Rect GetMonitorAreaNearestPointImpl(
-      const gfx::Point& point) OVERRIDE;
-  virtual gfx::NativeWindow GetWindowAtCursorScreenPointImpl() OVERRIDE;
-  virtual gfx::Size GetPrimaryMonitorSizeImpl() OVERRIDE;
-  virtual int GetNumMonitorsImpl() OVERRIDE;
+  virtual const gfx::Monitor* GetPrimaryMonitor() OVERRIDE;
+  virtual void AddMonitorObserver(gfx::MonitorObserver* observer) OVERRIDE;
+  virtual void RemoveMonitorObserver(gfx::MonitorObserver* observer) OVERRIDE;
 
  private:
-  // We currently support only one monitor. These two methods return the bounds
-  // and work area.
-  gfx::Rect GetBounds();
+  void Update();
 
   aura::RootWindow* root_window_;
 
+  // One monitor in testing environment.
+  scoped_ptr<MonitorAura> monitor_;
+
   DISALLOW_COPY_AND_ASSIGN(TestScreen);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_TEST_SCREEN_H_