Proper MouseEvent targeting. Adds a Window method that locates a Window for a given point.

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 AURA_ROOT_WINDOW_H_
+#define AURA_ROOT_WINDOW_H_
+#pragma once
+
+#include "aura/window.h"
+
+namespace aura {
+namespace internal {
+
+class RootWindow : public Window {

[sky, 2011/08/30 18:26:30]

nit: add a description?

+ public:
+  RootWindow();
+  virtual ~RootWindow();
+
+  // Handles a mouse event. Returns true if handled.
+  bool HandleMouseEvent(const MouseEvent& event);
+
+ private:
+  Window* mouse_pressed_handler_;
+
+  DISALLOW_COPY_AND_ASSIGN(RootWindow);
+};
+
+}  // namespace internal
+}  // namespace aura
+
+#endif  // AURA_ROOT_WINDOW_H_