Added GL_CHROMIUM_trace_marker feature as well as gpu_toplevel markers.

content/common/gpu/client/context_provider_command_buffer.h

 // Copyright (c) 2013 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.
 
 #ifndef CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
 #define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/synchronization/lock.h"
@@ skipping 46 matching lines @@
       scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d,
       const std::string& debug_name);
   ~ContextProviderCommandBuffer() override;
 
   void OnLostContext();
   void OnMemoryAllocationChanged(const gpu::MemoryAllocation& allocation);
 
  private:
   void InitializeCapabilities();
 
+  // Whether gpu_toplevel category is enabled.
+  const unsigned char* gpu_trace_top_level_category_;
+
   base::ThreadChecker main_thread_checker_;
   base::ThreadChecker context_thread_checker_;
 
   scoped_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
   scoped_ptr<webkit::gpu::GrContextForWebGraphicsContext3D> gr_context_;
 
   cc::ContextProvider::Capabilities capabilities_;
   std::string debug_name_;
 
   LostContextCallback lost_context_callback_;
   MemoryPolicyChangedCallback memory_policy_changed_callback_;
 
   base::Lock main_thread_lock_;
   bool destroyed_;
 
   class LostContextCallbackProxy;
   scoped_ptr<LostContextCallbackProxy> lost_context_callback_proxy_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER