Use GpuPreferences to avoid directly accessing switches in gpu related code

android_webview/browser/deferred_gpu_command_service.h

Index: android_webview/browser/deferred_gpu_command_service.h
diff --git a/android_webview/browser/deferred_gpu_command_service.h b/android_webview/browser/deferred_gpu_command_service.h
index b2f086650571653941d57a576437273817563eba..2c423740da2ef8633d96ee3d80c66644afcb7a95 100644
--- a/android_webview/browser/deferred_gpu_command_service.h
+++ b/android_webview/browser/deferred_gpu_command_service.h
@@ -16,6 +16,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_local.h"
 #include "base/time/time.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/command_buffer/service/in_process_command_buffer.h"
 
 namespace gpu {
@@ -73,9 +74,11 @@ class DeferredGpuCommandService
   static void RequestProcessGL(bool for_idle);
 
   DeferredGpuCommandService();
+  void InitGpuPreferences();
   size_t IdleQueueSize();
 
   base::Lock tasks_lock_;
+  gpu::GpuPreferences gpu_preferences_;
   std::queue<base::Closure> tasks_;
   std::queue<std::pair<base::Time, base::Closure> > idle_tasks_;