Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gpu/command_buffer/service/gles2_cmd_decoder_unittest_base.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 172 matching lines @@
 
   gl_.reset(new StrictMock<MockGLInterface>());
   ::gfx::MockGLInterface::SetGLInterface(gl_.get());
 
   SetupMockGLBehaviors();
 
   scoped_refptr<FeatureInfo> feature_info;
   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));
   bool use_default_textures = normalized_init.bind_generates_resource;
 
   InSequence sequence;
 
   surface_ = new gfx::GLSurfaceStub;
   surface_->SetSize(gfx::Size(kBackBufferWidth, kBackBufferHeight));
 
@@ skipping 1828 matching lines @@
   SetupDefaultProgram();
 }
 
 // Include the auto-generated part of this file. We split this because it means
 // we can easily edit the non-auto generated parts right here in this file
 // instead of having to edit some template or the code generator.
 #include "gpu/command_buffer/service/gles2_cmd_decoder_unittest_0_autogen.h"
 
 }  // namespace gles2
 }  // namespace gpu