Use GpuPreferences to avoid directly accessing switches in gpu related code

content/gpu/in_process_gpu_thread.cc

 // Copyright 2013 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/gpu/in_process_gpu_thread.h"
 
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "content/common/gpu/gpu_memory_buffer_factory.h"
 #include "content/gpu/gpu_child_thread.h"
 #include "content/gpu/gpu_process.h"
 #include "gpu/command_buffer/service/sync_point_manager.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
 #endif
 
 namespace content {
 
 InProcessGpuThread::InProcessGpuThread(
     const InProcessChildThreadParams& params,
+    const gpu::GpuPreferences* gpu_preferences,
     gpu::SyncPointManager* sync_point_manager_override)
     : base::Thread("Chrome_InProcGpuThread"),
       params_(params),
       gpu_process_(NULL),
+      gpu_preferences_(gpu_preferences),
       sync_point_manager_override_(sync_point_manager_override),
       gpu_memory_buffer_factory_(
           GpuMemoryBufferFactory::GetNativeType() != gfx::EMPTY_BUFFER
               ? GpuMemoryBufferFactory::CreateNativeType()
               : nullptr) {
   if (!sync_point_manager_override_) {
     sync_point_manager_.reset(new gpu::SyncPointManager(false));
     sync_point_manager_override_ = sync_point_manager_.get();
   }
 }
@@ skipping 13 matching lines @@
   base::android::AttachCurrentThreadWithName(thread_name());
   // Up the priority of the |io_thread_| on Android.
   io_thread_priority = base::ThreadPriority::DISPLAY;
 #endif
 
   gpu_process_ = new GpuProcess(io_thread_priority);
 
   // The process object takes ownership of the thread object, so do not
   // save and delete the pointer.
   GpuChildThread* child_thread = new GpuChildThread(
-      params_, gpu_memory_buffer_factory_.get(), sync_point_manager_override_);
+      gpu_preferences_, params_, gpu_memory_buffer_factory_.get(),
+      sync_point_manager_override_);
 
   // Since we are in the browser process, use the thread start time as the
   // process start time.
   child_thread->Init(base::Time::Now());
 
   gpu_process_->set_main_thread(child_thread);
 }
 
 void InProcessGpuThread::CleanUp() {
   SetThreadWasQuitProperly(true);
   delete gpu_process_;
 }
 
 base::Thread* CreateInProcessGpuThread(
     const InProcessChildThreadParams& params) {
-  return new InProcessGpuThread(params, nullptr);
+  return new InProcessGpuThread(params, nullptr, nullptr);
 }
 
 }  // namespace content