Use WebKit compositor in ui::Layer

ui/gfx/compositor/compositor_test_support.h

Index: ui/gfx/compositor/compositor_test_support.h
diff --git a/ui/gfx/compositor/compositor_test_support.h b/ui/gfx/compositor/compositor_test_support.h
new file mode 100644
index 0000000000000000000000000000000000000000..de520a07121816c87d6a8ff278beb307a1cbc53a
--- /dev/null
+++ b/ui/gfx/compositor/compositor_test_support.h
@@ -0,0 +1,19 @@
+// 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_GFX_COMPOSITOR_TEST_SUPPORT_H_
+#define UI_GFX_COMPOSITOR_TEST_SUPPORT_H_
+#pragma once
+
+namespace ui {
+
+class CompositorTestSupport {
+ public:
+  static void Initialize();
+  static void Terminate();
+};
+
+}  // namespace ui
+
+#endif  // UI_GFX_COMPOSITOR_TEST_SUPPORT_H_