Update from https://crrev.com/316786

gpu/blink/webgraphicscontext3d_in_process_command_buffer_impl.h

 // 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.
 
 #ifndef GPU_BLINK_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_
 #define GPU_BLINK_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
@@ skipping 39 matching lines @@
   static scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>
       WrapContext(
           scoped_ptr< ::gpu::GLInProcessContext> context,
           const blink::WebGraphicsContext3D::Attributes& attributes);
 
   virtual ~WebGraphicsContext3DInProcessCommandBufferImpl();
 
   size_t GetMappedMemoryLimit();
 
   bool InitializeOnCurrentThread();
+  void SetLock(base::Lock* lock);
 
   //----------------------------------------------------------------------
   // WebGraphicsContext3D methods
   virtual bool isContextLost();
 
   virtual WGC3Denum getGraphicsResetStatusARB();
 
   ::gpu::ContextSupport* GetContextSupport();
 
   ::gpu::gles2::GLES2Implementation* GetImplementation() {
@@ skipping 26 matching lines @@
 
   // The context we use for OpenGL rendering.
   scoped_ptr< ::gpu::GLInProcessContext> context_;
   // The GLES2Implementation we use for OpenGL rendering.
   ::gpu::gles2::GLES2Implementation* real_gl_;
 };
 
 }  // namespace gpu_blink
 
 #endif  // GPU_BLINK_WEBGRAPHICSCONTEXT3D_IN_PROCESS_COMMAND_BUFFER_IMPL_H_