Collapse the initialize methods in WebGraphicsContext3DCommandBufferImpl

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_H_
 #define CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 64 matching lines @@
    private:
     friend class base::RefCountedThreadSafe<SharedProviders>;
     ~SharedProviders();
   };
 
   base::ThreadChecker main_thread_checker_;
   base::ThreadChecker context_thread_checker_;
 
   scoped_refptr<SharedProviders> shared_providers_;
 
+  base::Lock context_lock_;  // Referenced by context3d_.
   std::unique_ptr<WebGraphicsContext3DCommandBufferImpl> context3d_;
   std::unique_ptr<gpu::gles2::GLES2TraceImplementation> trace_impl_;
   std::unique_ptr<skia_bindings::GrContextForGLES2Interface> gr_context_;
 
   gpu::SharedMemoryLimits memory_limits_;
   gpu::gles2::ContextCreationAttribHelper attributes_;
   command_buffer_metrics::ContextType context_type_;
 
   LostContextCallback lost_context_callback_;
 
-  base::Lock context_lock_;
-
   class LostContextCallbackProxy;
   std::unique_ptr<LostContextCallbackProxy> lost_context_callback_proxy_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_CONTEXT_PROVIDER_COMMAND_BUFFER_H_