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

content/common/gpu/gpu_channel.h

 // 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.
 
 #ifndef CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #define CONTENT_COMMON_GPU_GPU_CHANNEL_H_
 #pragma once
 
 #include <deque>
 #include <string>
@@ skipping 138 matching lines @@
   // Uniquely identifies the channel within this GPU process.
   std::string channel_id_;
 
   // Used to implement message routing functionality to CommandBuffer objects
   MessageRouter router_;
 
   // The share group that all contexts associated with a particular renderer
   // process use.
   scoped_refptr<gfx::GLShareGroup> share_group_;
 
+  scoped_refptr<gpu::gles2::MailboxManager> mailbox_manager_;
+
 #if defined(ENABLE_GPU)
   typedef IDMap<GpuCommandBufferStub, IDMapOwnPointer> StubMap;
   StubMap stubs_;
 #endif  // defined (ENABLE_GPU)
 
   bool log_messages_;  // True if we should log sent and received messages.
   gpu::gles2::DisallowedFeatures disallowed_features_;
   GpuWatchdog* watchdog_;
   bool software_;
   bool handle_messages_scheduled_;
   bool processed_get_state_fast_;
   int32 num_contexts_preferring_discrete_gpu_;
 
   base::WeakPtrFactory<GpuChannel> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannel);
 };
 
 #endif  // CONTENT_COMMON_GPU_GPU_CHANNEL_H_