Allow textures to be moved from one GL context group to another.

gpu/command_buffer/service/feature_info.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/feature_info.h"
 
 #include <set>
 
 #include "base/string_number_conversions.h"
 #include "gpu/command_buffer/service/gl_utils.h"
@@ skipping 103 matching lines @@
   AddExtensionString("GL_CHROMIUM_resource_safe");
   AddExtensionString("GL_CHROMIUM_resize");
   AddExtensionString("GL_CHROMIUM_strict_attribs");
   AddExtensionString("GL_CHROMIUM_swapbuffers_complete_callback");
   AddExtensionString("GL_CHROMIUM_rate_limit_offscreen_context");
   AddExtensionString("GL_CHROMIUM_set_visibility");
   AddExtensionString("GL_CHROMIUM_gpu_memory_manager");
   AddExtensionString("GL_CHROMIUM_discard_framebuffer");
   AddExtensionString("GL_CHROMIUM_command_buffer_query");
   AddExtensionString("GL_CHROMIUM_copy_texture");
+  AddExtensionString("GL_CHROMIUM_texture_mailbox");
   AddExtensionString("GL_ANGLE_translated_shader_source");
 
   if (ext.Have("GL_ANGLE_translated_shader_source")) {
     feature_flags_.angle_translated_shader_source = true;
   }
 
   // Only turn this feature on if it is requested. Not by default.
   if (desired_features && ext.Desire("GL_CHROMIUM_webglsl")) {
     AddExtensionString("GL_CHROMIUM_webglsl");
     feature_flags_.chromium_webglsl = true;
@@ skipping 331 matching lines @@
 }
 
 void FeatureInfo::AddExtensionString(const std::string& str) {
   if (extensions_.find(str) == std::string::npos) {
     extensions_ += (extensions_.empty() ? "" : " ") + str;
   }
 }
 
 }  // namespace gles2
 }  // namespace gpu