cc: Implement unified BeginFrame on aura

ui/compositor/test/compositor_test_api.h

+// Copyright 2015 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_COMPOSITOR_TEST_COMPOSITOR_TEST_API_H_
+#define UI_COMPOSITOR_TEST_COMPOSITOR_TEST_API_H_
+
+#include "base/basictypes.h"
+
+namespace cc {
+struct BeginFrameArgs;
+}
+
+namespace ui {
+
+class Compositor;
+
+// Use the api in this class to access private members of ui::Compositor.
+class CompositorTestAPI {
+ public:
+  explicit CompositorTestAPI(Compositor* compositor);
+
+  ~CompositorTestAPI();
+
+  // An accessor for |missed_begin_frame_args_| in ui::Compositor.
+  cc::BeginFrameArgs missed_begin_frame_args();
+
+ private:
+  Compositor* compositor_;
+
+  DISALLOW_COPY_AND_ASSIGN(CompositorTestAPI);
+};
+
+}  // namespace ui
+
+#endif  // UI_COMPOSITOR_TEST_COMPOSITOR_TEST_API_H_