Wires up mouse capture code for aura.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index d709ce3311c1548400f52d56c893329fb5b2c18a..5d3de84a3ccaf53cd4f47da443f75af374c3ceda 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -26,12 +26,33 @@ class RootWindow : public Window {
   // 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);
 };