content: implement unittests backend for Ozone GBM

ui/ozone/public/ozone_gpu_test_helper.cc

 // 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.
 
 #include "ui/ozone/public/ozone_gpu_test_helper.h"
 
+#include "base/run_loop.h"
 #include "base/thread_task_runner_handle.h"
 #include "ipc/ipc_listener.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
 #include "ipc/message_filter.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 #include "ui/ozone/public/gpu_platform_support_host.h"
 #include "ui/ozone/public/ozone_platform.h"
 
 namespace ui {
@@ skipping 107 matching lines @@
                             base::Unretained(fake_gpu_process_.get())));
   fake_gpu_process_->Init();
 
   fake_gpu_process_host_.reset(new FakeGpuProcessHost(
       gpu_task_runner, io_helper_thread_->task_runner()));
   fake_gpu_process_host_->Init();
 
   return true;
 }
 
+// static
+std::unique_ptr<OzoneInitializerForTest> OzoneInitializerForTest::Create() {
+  std::unique_ptr<OzoneInitializerForTest> self(new OzoneInitializerForTest());
+  if (!self->Initialize())
+    return nullptr;
+  return self;
+}
+
+OzoneInitializerForTest::OzoneInitializerForTest() {}
+
+OzoneInitializerForTest::~OzoneInitializerForTest() {}
+
+bool OzoneInitializerForTest::Initialize() {
+  OzonePlatform::InitializeForUI();
+  OzonePlatform::InitializeForGPU();
+  gpu_helper_.reset(new OzoneGpuTestHelper);
+  if (!gpu_helper_->Initialize(base::ThreadTaskRunnerHandle::Get(),
+                               base::ThreadTaskRunnerHandle::Get())) {
+    return false;
+  }
+  {
+    base::MessageLoop::ScopedNestableTaskAllower allow(
+        base::MessageLoop::current());
+    base::RunLoop().RunUntilIdle();
+  }
+  return true;
+}
+
 }  // namespace ui