Implement TextureImageTransportSurface using texture mailbox

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,
                                         GLenum internal_format,
                                         GLsizei width,
                                         GLsizei height,
                                         GLsizei depth,
                                         GLint border,
                                         GLenum format,
                                         GLenum type,
                                         bool cleared)
     : target(target),
       internal_format(internal_format),
       width(width),
       height(height),
       depth(depth),
       border(border),
       format(format),
       type(type),
       cleared(cleared) {
 }
 
+TextureDefinition::LevelInfo::LevelInfo()
+    : target(0),
+      internal_format(0),
+      width(0),
+      height(0),
+      depth(0),
+      border(0),
+      format(0),
+      type(0),
+      cleared(true) {
+}
+
 TextureDefinition::TextureDefinition(GLenum target,
                                      GLuint service_id,
                                      bool immutable,
                                      const LevelInfos& level_infos)
     : target_(target),
       service_id_(service_id),
       immutable_(immutable),
       level_infos_(level_infos) {
 }
 
 TextureDefinition::~TextureDefinition() {
   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