Makes MouseWatcher work while in metro mode

ui/views/widget/desktop_aura/desktop_event_client.h

Index: ui/views/widget/desktop_aura/desktop_event_client.h
diff --git a/ui/views/widget/desktop_aura/desktop_event_client.h b/ui/views/widget/desktop_aura/desktop_event_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..d16b5c9e4cdb994c5482d933200cf2b85710d38e
--- /dev/null
+++ b/ui/views/widget/desktop_aura/desktop_event_client.h
@@ -0,0 +1,31 @@
+// Copyright 2013 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_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_EVENT_CLIENT_H_
+#define UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_EVENT_CLIENT_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "ui/aura/client/event_client.h"
+#include "ui/views/views_export.h"
+
+namespace views {
+
+class VIEWS_EXPORT DesktopEventClient : public aura::client::EventClient {
+ public:
+  DesktopEventClient();
+  virtual ~DesktopEventClient();
+
+  // Overridden from aura::client::EventClient:
+  virtual bool CanProcessEventsWithinSubtree(
+      const aura::Window* window) const OVERRIDE;
+  virtual ui::EventTarget* GetToplevelEventTarget() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DesktopEventClient);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_WIDGET_DESKTOP_AURA_DESKTOP_EVENT_CLIENT_H_