ui: Move compositor/ directory out of gfx/, up to ui/.

ui/compositor/test/compositor_test_support.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// 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_GFX_COMPOSITOR_TEST_TEST_SUPPORT_H_
 #define UI_GFX_COMPOSITOR_TEST_TEST_SUPPORT_H_
 #pragma once
 
 namespace ui {
 
 class CompositorTestSupport {
  public:
   // Called by programs that want to use a real compositor,
   // but skip the typical initialization of browser_main.cc.
   static void Initialize();
   static void Terminate();
 };
 
 }  // namespace ui
 
 #endif  // UI_GFX_COMPOSITOR_TEST_TEST_SUPPORT_H_