Add reference-counting for mailbox textures.

gpu/command_buffer/service/texture_definition.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/texture_definition.h"
 
 namespace gpu {
 namespace gles2 {
 
 TextureDefinition::LevelInfo::LevelInfo(GLenum target,
@@ skipping 42 matching lines @@
       min_filter_(min_filter),
       mag_filter_(mag_filter),
       wrap_s_(wrap_s),
       wrap_t_(wrap_t),
       usage_(usage),
       immutable_(immutable),
       level_infos_(level_infos) {
 }
 
 TextureDefinition::~TextureDefinition() {
+  if (!destroy_callback_.is_null())
+    destroy_callback_.Run(this);
+
   DCHECK_EQ(0U, service_id_) << "TextureDefinition leaked texture.";
 }
 
 GLuint TextureDefinition::ReleaseServiceId() {
   GLuint service_id = service_id_;
   service_id_ = 0;
   return service_id;
 }
 
 }  // namespace gles2
 }  // namespace gpu