Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/command_buffer/tests/gl_manager.h

Index: gpu/command_buffer/tests/gl_manager.h
diff --git a/gpu/command_buffer/tests/gl_manager.h b/gpu/command_buffer/tests/gl_manager.h
index f0b2a2127d26454d8a5ae3564f0c1b88f2c5fb0e..7c7f1a57d9fdbd60cca1939eb12a0984c584acd8 100644
--- a/gpu/command_buffer/tests/gl_manager.h
+++ b/gpu/command_buffer/tests/gl_manager.h
@@ -14,6 +14,7 @@
 #include "gpu/command_buffer/client/gpu_control.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/command_buffer/service/feature_info.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
@@ -151,6 +152,8 @@ class GLManager : private GpuControl {
                        gpu::CommandBufferId command_buffer_id,
                        uint64_t release);
 
+  gpu::GpuPreferences gpu_preferences_;
+
   SyncPointManager* sync_point_manager_;  // Non-owning.
 
   scoped_refptr<SyncPointOrderData> sync_point_order_data_;