RendererGLContext supports reparenting a GL context.

content/renderer/gpu/gpu_channel_host.cc

 // 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.
 
 #include "content/renderer/gpu/gpu_channel_host.h"
 
 #include "content/common/child_process.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/renderer/gpu/command_buffer_proxy.h"
 #include "content/renderer/gpu/gpu_surface_proxy.h"
@@ skipping 121 matching lines @@
   CommandBufferProxy* command_buffer = new CommandBufferProxy(this, route_id);
   router_.AddRoute(route_id, command_buffer);
   proxies_[route_id] = command_buffer;
   return command_buffer;
 #else
   return NULL;
 #endif
 }
 
 CommandBufferProxy* GpuChannelHost::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) {
 #if defined(ENABLE_GPU)
   // An error occurred. Need to get the host again to reinitialize it.
   if (!channel_.get())
     return NULL;
 
   GPUCreateCommandBufferConfig init_params;
   init_params.allowed_extensions = allowed_extensions;
   init_params.attribs = attribs;
   init_params.active_url = active_url;
-  int32 parent_route_id = parent ? parent->route_id() : 0;
   int32 route_id;
-  if (!Send(new GpuChannelMsg_CreateOffscreenCommandBuffer(parent_route_id,
-                                                           size,
+  if (!Send(new GpuChannelMsg_CreateOffscreenCommandBuffer(size,
                                                            init_params,
-                                                           parent_texture_id,
                                                            &route_id))) {
     return NULL;
   }
 
   if (route_id == MSG_ROUTING_NONE)
     return NULL;
 
   CommandBufferProxy* command_buffer = new CommandBufferProxy(this, route_id);
   router_.AddRoute(route_id, command_buffer);
   proxies_[route_id] = command_buffer;
@@ skipping 33 matching lines @@
 
 void GpuChannelHost::DestroySurface(GpuSurfaceProxy* surface) {
 #if defined(ENABLE_GPU)
   Send(new GpuChannelMsg_DestroySurface(surface->route_id()));
   if (router_.ResolveRoute(surface->route_id()))
     router_.RemoveRoute(surface->route_id());
 
   delete surface;
 #endif
 }