Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

Index: gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
diff --git a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
index 7b08764c3d36c4e3183e7464f2a3b07ebb3274f5..f15001eb6491463c674b394e8bc1ba39d91b98cf 100644
--- a/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
+++ b/gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc
@@ -190,7 +190,8 @@ void GLES2DecoderTestBase::InitDecoderWithCommandLine(
   if (command_line)
     feature_info = new FeatureInfo(*command_line);
   group_ = scoped_refptr<ContextGroup>(
-      new ContextGroup(NULL, memory_tracker_, new ShaderTranslatorCache,
+      new ContextGroup(gpu_preferences_, NULL, memory_tracker_,
+                       new ShaderTranslatorCache(gpu_preferences_),
                        new FramebufferCompletenessCache, feature_info.get(),
                        new SubscriptionRefSet, new ValueStateMap,
                        normalized_init.bind_generates_resource));