Update from chromium https://crrev.com/301315

gpu/command_buffer/service/context_group.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/command_buffer/service/context_group.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/command_line.h"
 #include "base/strings/string_util.h"
 #include "base/sys_info.h"
 #include "gpu/command_buffer/service/buffer_manager.h"
 #include "gpu/command_buffer/service/framebuffer_manager.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
 #include "gpu/command_buffer/service/gpu_switches.h"
-#include "gpu/command_buffer/service/mailbox_manager.h"
+#include "gpu/command_buffer/service/mailbox_manager_impl.h"
 #include "gpu/command_buffer/service/memory_tracking.h"
 #include "gpu/command_buffer/service/program_manager.h"
 #include "gpu/command_buffer/service/renderbuffer_manager.h"
 #include "gpu/command_buffer/service/shader_manager.h"
 #include "gpu/command_buffer/service/texture_manager.h"
 #include "gpu/command_buffer/service/transfer_buffer_manager.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace gpu {
 namespace gles2 {
@@ skipping 17 matching lines @@
       max_fragment_uniform_vectors_(0u),
       max_varying_vectors_(0u),
       max_vertex_uniform_vectors_(0u),
       max_color_attachments_(1u),
       max_draw_buffers_(1u),
       program_cache_(NULL),
       feature_info_(feature_info),
       draw_buffer_(GL_BACK) {
   {
     if (!mailbox_manager_.get())
-      mailbox_manager_ = new MailboxManager;
+      mailbox_manager_ = new MailboxManagerImpl;
     if (!feature_info.get())
       feature_info_ = new FeatureInfo;
     TransferBufferManager* manager = new TransferBufferManager();
     transfer_buffer_manager_.reset(manager);
     manager->Initialize();
   }
 }
 
 static void GetIntegerv(GLenum pname, uint32* var) {
   GLint value = 0;
@@ skipping 305 matching lines @@
     GLenum pname, GLint min_required, uint32* v) {
   uint32 value = 0;
   GetIntegerv(pname, &value);
   bool result = CheckGLFeatureU(min_required, &value);
   *v = value;
   return result;
 }
 
 }  // namespace gles2
 }  // namespace gpu