Use GpuPreferences to avoid directly accessing switches in gpu related code

gpu/command_buffer/service/in_process_command_buffer.h

Index: gpu/command_buffer/service/in_process_command_buffer.h
diff --git a/gpu/command_buffer/service/in_process_command_buffer.h b/gpu/command_buffer/service/in_process_command_buffer.h
index 37b888a6d56c848887c42e68c3994966795f117c..2c0d3db62af8a4f952d6f9a40a28e95c3ba281ea 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.h
+++ b/gpu/command_buffer/service/in_process_command_buffer.h
@@ -24,6 +24,7 @@
 #include "base/threading/thread.h"
 #include "gpu/command_buffer/client/gpu_control.h"
 #include "gpu/command_buffer/common/command_buffer.h"
+#include "gpu/command_buffer/service/gpu_preferences.h"
 #include "gpu/gpu_export.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 #include "ui/gfx/native_widget_types.h"
@@ -51,6 +52,7 @@ class StreamTextureManagerInProcess;
 #endif
 
 namespace gpu {
+struct GpuPreferences;
 class SyncPointClient;
 class SyncPointOrderData;
 class SyncPointManager;
@@ -159,6 +161,7 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
     virtual scoped_refptr<gles2::FramebufferCompletenessCache>
     framebuffer_completeness_cache() = 0;
     virtual SyncPointManager* sync_point_manager() = 0;
+    const gpu::GpuPreferences& gpu_preferences();
     scoped_refptr<gfx::GLShareGroup> share_group();
     scoped_refptr<gles2::MailboxManager> mailbox_manager();
     scoped_refptr<gles2::SubscriptionRefSet> subscription_ref_set();
@@ -166,6 +169,7 @@ class GPU_EXPORT InProcessCommandBuffer : public CommandBuffer,
     gpu::gles2::ProgramCache* program_cache();
 
    private:
+    gpu::GpuPreferences gpu_preferences_;
     scoped_refptr<gfx::GLShareGroup> share_group_;
     scoped_refptr<gles2::MailboxManager> mailbox_manager_;
     scoped_refptr<gles2::SubscriptionRefSet> subscription_ref_set_;