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 f26adcbe5b31b950e50cd154a60bb65e809fe6b6..8b6d24a61e1845411739a25fb7488c468ae9d671 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));