Update from https://crrev.com/320343

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
 #include <GLES2/gl2ext.h>
 #include <GLES2/gl2extchromium.h>
 
 #include <string>
 
 #include "base/atomicops.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/callback.h"
 #include "base/logging.h"
 #include "gpu/command_buffer/client/gles2_implementation.h"
 #include "gpu/command_buffer/common/gles2_cmd_utils.h"
 #include "gpu/skia_bindings/gl_bindings_skia_cmd_buffer.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gl/gl_implementation.h"
 
+using blink::WGC3Denum;
 using gpu::gles2::GLES2Implementation;
 using gpu::GLInProcessContext;
 
 namespace gpu_blink {
 
 // static
 scoped_ptr<WebGraphicsContext3DInProcessCommandBufferImpl>
 WebGraphicsContext3DInProcessCommandBufferImpl::CreateViewContext(
     const blink::WebGraphicsContext3D::Attributes& attributes,
     bool lose_context_when_out_of_memory,
@@ skipping 136 matching lines @@
 
 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