content: implement unittests backend for Ozone GBM

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 <memory>
 
 #include "base/macros.h"
@@ skipping 27 matching lines @@
       const scoped_refptr<base::SingleThreadTaskRunner>& gpu_task_runner);
 
  private:
   std::unique_ptr<FakeGpuProcess> fake_gpu_process_;
   std::unique_ptr<FakeGpuProcessHost> fake_gpu_process_host_;
   std::unique_ptr<base::Thread> io_helper_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(OzoneGpuTestHelper);
 };
 
+// Helper class for tests to initialize both UI and GPU Ozone platform.
+class OZONE_EXPORT OzoneInitializerForTest {
+ public:
+  static std::unique_ptr<OzoneInitializerForTest> Create();
+  ~OzoneInitializerForTest();
+
+ private:
+  OzoneInitializerForTest();
+  bool Initialize();
+
+  std::unique_ptr<OzoneGpuTestHelper> gpu_helper_;
+
+  DISALLOW_COPY_AND_ASSIGN(OzoneInitializerForTest);
+};
+
 }  // namespace ui
 
 #endif  // UI_OZONE_PUBLIC_OZONE_GPU_THREAD_HELPER_H_