RendererGLContext supports reparenting a GL context.

gpu/gles2_conform_support/egl/display.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 "gpu/gles2_conform_support/egl/display.h"
 
 #include <vector>
 #include "gpu/command_buffer/client/gles2_lib.h"
 #include "gpu/command_buffer/service/command_buffer_service.h"
 #include "gpu/command_buffer/service/gles2_cmd_decoder.h"
@@ skipping 94 matching lines @@
     // We do not support more than one window surface.
     return EGL_NO_SURFACE;
   }
 
   using gpu::GpuScheduler;
   std::vector<int32> attribs;
   scoped_ptr<GpuScheduler> gpu_scheduler(
       new GpuScheduler(command_buffer_.get(), NULL, NULL));
   if (!gpu_scheduler->Initialize(
       win, gfx::Size(), gpu::gles2::DisallowedExtensions(), NULL,
-      attribs, NULL, 0, NULL))
+      attribs, NULL))
     return EGL_NO_SURFACE;
 
   command_buffer_->SetPutOffsetChangeCallback(
       NewCallback(gpu_scheduler.get(), &GpuScheduler::PutChanged));
   gpu_scheduler_.reset(gpu_scheduler.release());
   surface_.reset(new Surface(win));
 
   return surface_.get();
 }
 
@@ skipping 52 matching lines @@
   } else {
     DCHECK(IsValidSurface(draw));
     DCHECK(IsValidSurface(read));
     DCHECK(IsValidContext(ctx));
     gles2::SetGLContext(context_.get());
   }
   return true;
 }
 
 }  // namespace egl