RendererGLContext supports reparenting a GL context.

content/renderer/gpu/command_buffer_proxy.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/command_buffer_proxy.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/process_util.h"
 #include "base/shared_memory.h"
@@ skipping 314 matching lines @@
     gpu::error::Error error) {
   // Not implemented in proxy.
   NOTREACHED();
 }
 
 void CommandBufferProxy::OnSwapBuffers() {
   if (swap_buffers_callback_.get())
     swap_buffers_callback_->Run();
 }
 
+bool CommandBufferProxy::SetParent(CommandBufferProxy* parent_command_buffer,
+                                   uint32 parent_texture_id) {
+  if (last_state_.error != gpu::error::kNoError)
+    return false;
+
+  bool result;
+  if (parent_command_buffer) {
+    if (!Send(new GpuCommandBufferMsg_SetParent(
+        route_id_,
+        parent_command_buffer->route_id_,
+        parent_texture_id,
+        &result))) {
+      return false;
+    }
+  } else {
+    if (!Send(new GpuCommandBufferMsg_SetParent(
+        route_id_,
+        MSG_ROUTING_NONE,
+        0,
+        &result))) {
+      return false;
+    }
+  }
+
+  return result;
+}
+
 void CommandBufferProxy::SetSwapBuffersCallback(Callback0::Type* callback) {
   swap_buffers_callback_.reset(callback);
 }
 
 void CommandBufferProxy::ResizeOffscreenFrameBuffer(const gfx::Size& size) {
   if (last_state_.error != gpu::error::kNoError)
     return;
 
   Send(new GpuCommandBufferMsg_ResizeOffscreenFrameBuffer(route_id_, size));
 }
@@ skipping 32 matching lines @@
   delete msg;
   return false;
 }
 
 void CommandBufferProxy::OnUpdateState(const gpu::CommandBuffer::State& state) {
   // Handle wraparound. It works as long as we don't have more than 2B state
   // updates in flight across which reordering occurs.
   if (state.generation - last_state_.generation < 0x80000000U)
     last_state_ = state;
 }