gpu: Mailbox emulation with EGLImage

ui/gl/gl_image.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 "ui/gl/gl_image.h"
 
 #include "base/logging.h"
 
 namespace gfx {
 
 GLImage::GLImage() {}
 
 bool GLImage::BindTexImage(unsigned target) {
   NOTIMPLEMENTED();
   return false;
 }
 
 void GLImage::ReleaseTexImage(unsigned target) {
   NOTIMPLEMENTED();
 }
 
 void GLImage::WillUseTexImage() {
   NOTIMPLEMENTED();
 }
 
 void GLImage::DidUseTexImage() {
   NOTIMPLEMENTED();
 }
 
+void GLImage::WillModifyTexImage() {}
+
+void GLImage::DidModifyTexImage() {}
+
 void GLImage::SetReleaseAfterUse() {
   // Default no-op implementation for workaround.
 }
 
 GLImage::~GLImage() {}
 
 }  // namespace gfx