Fix UiThreadGpu initialization for video accelerator tests

ui/ozone/public/ozone_gpu_test_helper.h

+// Copyright 2014 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_OZONE_PUBLIC_OZONE_GPU_THREAD_HELPER_H_
+#define UI_OZONE_PUBLIC_OZONE_GPU_THREAD_HELPER_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/ozone/ozone_export.h"
+
+namespace base {
+class SingleThreadTaskRunner;
+class Thread;
+}
+
+namespace ui {
+
+class FakeGpuProcess;
+class FakeGpuProcessHost;
+
+// Helper class for applications that do not have a dedicated GPU channel.
+//
+// This sets up message forwarding between the "gpu" and "ui" threads.
+class OZONE_EXPORT OzoneGpuTestHelper {
+ public:
+  OzoneGpuTestHelper();
+  virtual ~OzoneGpuTestHelper();
+
+  // Start processing gpu messages. The host process will be using the
+  // |gpu_task_runner| to post messages intended for the GPU thread. The "gpu"
+  // process will be using the |ui_task_runner| to post messages intended for
+  // the "ui" thread.
+  bool Initialize(
+      const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner,
+      const scoped_refptr<base::SingleThreadTaskRunner>& gpu_task_runner);
+
+ private:
+  scoped_ptr<FakeGpuProcess> fake_gpu_process_;
+  scoped_ptr<FakeGpuProcessHost> fake_gpu_process_host_;
+  scoped_ptr<base::Thread> io_helper_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(OzoneGpuTestHelper);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PUBLIC_OZONE_GPU_THREAD_HELPER_H_