Update from https://crrev.com/316786

gpu/blink/webgraphicscontext3d_in_process_command_buffer_impl.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/blink/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
 #define GL_GLEXT_PROTOTYPES 1
 #endif
@@ skipping 135 matching lines @@
   return true;
 }
 
 bool
 WebGraphicsContext3DInProcessCommandBufferImpl::InitializeOnCurrentThread() {
   if (!MaybeInitializeGL())
     return false;
   return context_ && !isContextLost();
 }
 
+void WebGraphicsContext3DInProcessCommandBufferImpl::SetLock(base::Lock* lock) {
+  context_->SetLock(lock);
+}
+
 bool WebGraphicsContext3DInProcessCommandBufferImpl::isContextLost() {
   return context_lost_reason_ != GL_NO_ERROR;
 }
 
 WGC3Denum WebGraphicsContext3DInProcessCommandBufferImpl::
     getGraphicsResetStatusARB() {
   return context_lost_reason_;
 }
 
 ::gpu::ContextSupport*
 WebGraphicsContext3DInProcessCommandBufferImpl::GetContextSupport() {
   return real_gl_;
 }
 
 void WebGraphicsContext3DInProcessCommandBufferImpl::OnContextLost() {
   // TODO(kbr): improve the precision here.
   context_lost_reason_ = GL_UNKNOWN_CONTEXT_RESET_ARB;
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu_blink