RendererGLContext supports reparenting a GL context.

content/renderer/gpu/gpu_channel_host.h

 // Copyright (c) 2011 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_RENDERER_GPU_GPU_CHANNEL_HOST_H_
 #define CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 58 matching lines @@
   // Create and connect to a command buffer in the GPU process.
   CommandBufferProxy* CreateViewCommandBuffer(
       gfx::PluginWindowHandle compositing_surface,
       int render_view_id,
       const std::string& allowed_extensions,
       const std::vector<int32>& attribs,
       const GURL& active_url);
 
   // Create and connect to a command buffer in the GPU process.
   CommandBufferProxy* CreateOffscreenCommandBuffer(
-      CommandBufferProxy* parent,
       const gfx::Size& size,
       const std::string& allowed_extensions,
       const std::vector<int32>& attribs,
-      uint32 parent_texture_id,
       const GURL& active_url);
 
   // Destroy a command buffer created by this channel.
   void DestroyCommandBuffer(CommandBufferProxy* command_buffer);
 
   // Create a surface in the GPU process. Returns null on failure.
   GpuSurfaceProxy* CreateOffscreenSurface(const gfx::Size& size);
 
   // Destroy a surface in the GPU process.
   void DestroySurface(GpuSurfaceProxy* surface);
@@ skipping 27 matching lines @@
   scoped_refptr<GpuVideoServiceHost> gpu_video_service_host_;
 
   // This is a MessageFilter to intercept IPC messages related to transport
   // textures. These messages are routed to TransportTextureHost.
   scoped_refptr<TransportTextureService> transport_texture_service_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuChannelHost);
 };
 
 #endif  // CONTENT_RENDERER_GPU_GPU_CHANNEL_HOST_H_