Add gpu_main_thread_factory.h to expose less of content's guts.

content/public/test/content_test_suite_base.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 "content/public/test/content_test_suite_base.h"
 
 #include <memory>
 
 #include "base/compiler_specific.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/test/test_suite.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "build/build_config.h"
-#include "content/browser/gpu/gpu_process_host.h"
+#include "content/browser/gpu/gpu_main_thread_factory.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/utility_process_host_impl.h"
 #include "content/common/url_schemes.h"
 #include "content/gpu/in_process_gpu_thread.h"
 #include "content/public/common/content_client.h"
 #include "content/renderer/in_process_renderer_thread.h"
 #include "content/utility/in_process_utility_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/base/ui_base_paths.h"
@@ skipping 72 matching lines @@
   SetContentClient(content_client);
   content::RegisterContentSchemes(false);
   SetContentClient(NULL);
 }
 
 void ContentTestSuiteBase::RegisterInProcessThreads() {
   UtilityProcessHostImpl::RegisterUtilityMainThreadFactory(
       CreateInProcessUtilityThread);
   RenderProcessHostImpl::RegisterRendererMainThreadFactory(
       CreateInProcessRendererThread);
-  GpuProcessHost::RegisterGpuMainThreadFactory(CreateInProcessGpuThread);
+  content::RegisterGpuMainThreadFactory(CreateInProcessGpuThread);
 }
 
 }  // namespace content