Use GpuPreferences to avoid directly accessing switches in gpu related code

content/browser/android/synchronous_compositor_base.cc

Index: content/browser/android/synchronous_compositor_base.cc
diff --git a/content/browser/android/synchronous_compositor_base.cc b/content/browser/android/synchronous_compositor_base.cc
index e218d4020d143893b23da78d98cc8861ea145cde..cdef2659cba31738031883eea03cb577576be86f 100644
--- a/content/browser/android/synchronous_compositor_base.cc
+++ b/content/browser/android/synchronous_compositor_base.cc
@@ -21,19 +21,23 @@ class SynchronousCompositorClient;
 
 namespace {
 
+const gpu::GpuPreferences* g_gpu_preferences = nullptr;

[boliu, 2016/02/26 22:17:32]

LazyInstance<gpu::GpuPreferences>, also const won't compile

[Peng, 2016/02/29 16:09:22]

I don't see why need LazyInstance. But anyway, I removed g_gpu_preferences &
g_sync_point_manager by using a pointer of the g_gpu_service.

Done

 gpu::SyncPointManager* g_sync_point_manager = nullptr;
 
 base::Thread* CreateInProcessGpuThreadForSynchronousCompositor(
     const InProcessChildThreadParams& params) {
   DCHECK(g_sync_point_manager);
-  return new InProcessGpuThread(params, g_sync_point_manager);
+  return new InProcessGpuThread(params, g_gpu_preferences,
+                                g_sync_point_manager);
 }
 
 }  // namespace
 
 void SynchronousCompositor::SetGpuService(
     scoped_refptr<gpu::InProcessCommandBuffer::Service> service) {
+  DCHECK(!g_gpu_preferences);
   DCHECK(!g_sync_point_manager);
+  g_gpu_preferences = &service->gpu_preferences();
   g_sync_point_manager = service->sync_point_manager();
   GpuProcessHost::RegisterGpuMainThreadFactory(
       CreateInProcessGpuThreadForSynchronousCompositor);