Wires up mouse capture code for aura.

ui/aura/root_window.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_AURA_ROOT_WINDOW_H_
 #define UI_AURA_ROOT_WINDOW_H_
 #pragma once
 
 #include "ui/aura/window.h"
 
 namespace aura {
 namespace internal {
 
 class FocusManager;
 
 // A Window subclass that handles event targeting for certain types of
 // MouseEvent.
 class RootWindow : public Window {
  public:
   RootWindow();
   virtual ~RootWindow();
 
   // Handles a mouse event. Returns true if handled.
   bool HandleMouseEvent(const MouseEvent& event);
 
   // Handles a key event. Returns true if handled.
   bool HandleKeyEvent(const KeyEvent& event);
 
+  // Sets capture to the specified window.
+  void SetCapture(Window* window);
+
+  // If |window| has mouse capture, the current capture window is set to NULL.
+  void ReleaseCapture(Window* window);
+
+  // Returns the window that has mouse capture.
+  Window* capture_window() { return capture_window_; }
+
+  // Invoked when a child window is destroyed. Cleans up any references to the
+  // Window.
+  void WindowDestroying(Window* window);
+
+  // Current handler for mouse events.
+  Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
+
   // Overridden from Window:
   virtual FocusManager* GetFocusManager() OVERRIDE;
 
+ protected:
+  // Overridden from Window:
+  virtual internal::RootWindow* GetRoot() OVERRIDE;
+
  private:
   Window* mouse_pressed_handler_;
   scoped_ptr<FocusManager> focus_manager_;
+  Window* capture_window_;
 
   DISALLOW_COPY_AND_ASSIGN(RootWindow);
 };
 
 }  // namespace internal
 }  // namespace aura
 
 #endif  // UI_AURA_ROOT_WINDOW_H_