Use GpuPreferences to avoid directly accessing switches in gpu related code

content/gpu/in_process_gpu_thread.cc

Index: content/gpu/in_process_gpu_thread.cc
diff --git a/content/gpu/in_process_gpu_thread.cc b/content/gpu/in_process_gpu_thread.cc
index f0a97b7cdb6c561edbb72971b596ae7f7282a70d..ce9332c79cb2309ddecb516ac2a81f2b8d66161c 100644
--- a/content/gpu/in_process_gpu_thread.cc
+++ b/content/gpu/in_process_gpu_thread.cc
@@ -19,10 +19,12 @@ 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
@@ -56,7 +58,8 @@ void InProcessGpuThread::Init() {
   // 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.
@@ -72,7 +75,7 @@ void InProcessGpuThread::CleanUp() {
 
 base::Thread* CreateInProcessGpuThread(
     const InProcessChildThreadParams& params) {
-  return new InProcessGpuThread(params, nullptr);
+  return new InProcessGpuThread(params, nullptr, nullptr);
 }
 
 }  // namespace content