content: implement unittests backend for Ozone GBM

gpu/command_buffer/common/unittest_main.cc

 // Copyright (c) 2012 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 "base/bind.h"
+#include "base/command_line.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "base/test/test_suite.h"
 
+#if defined(USE_OZONE)
+#include "base/message_loop/message_loop.h"
+#include "ui/ozone/public/client_native_pixmap_factory.h"
+#include "ui/ozone/public/ozone_gpu_test_helper.h"
+#endif
+
 int main(int argc, char** argv) {
+  base::CommandLine::Init(argc, argv);
+  base::AtExitManager exit_manager;
+#if defined(USE_OZONE)
+  base::MessageLoopForUI message_loop;
+  std::unique_ptr<ui::OzoneInitializerForTest> ozone_test =
+      ui::OzoneInitializerForTest::Create();
+  std::unique_ptr<ui::ClientNativePixmapFactory> client_native_pixmap_factory_ =
+      ui::ClientNativePixmapFactory::Create();
+  ui::ClientNativePixmapFactory::SetInstance(
+      client_native_pixmap_factory_.get());
+#endif
   base::TestSuite test_suite(argc, argv);
   return base::LaunchUnitTests(
       argc, argv,
       base::Bind(&base::TestSuite::Run, base::Unretained(&test_suite)));
 }