Removed "compositor" child window that was created by the GPU process.

ui/gfx/gl/gl_context.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 UI_GFX_GL_GL_CONTEXT_H_
 #define UI_GFX_GL_GL_CONTEXT_H_
 #pragma once
 
 #include <string>
 
 #include "build/build_config.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 
+class GLSurface;
+
 // Encapsulates an OpenGL context, hiding platform specific management.
 class GLContext {
  public:
   GLContext() {}
   virtual ~GLContext() {}
 
   // Destroys the GL context.
   virtual void Destroy() = 0;
 
   // Makes the GL context current on the current thread.
   virtual bool MakeCurrent() = 0;
 
+  // Releases this GL context as current on the current thread. TODO(apatrick):
+  // implement this in the other GLContexts.
+  virtual void ReleaseCurrent();
+
   // Returns true if this context is current.
   virtual bool IsCurrent() = 0;
 
   // Returns true if this context is offscreen.
   virtual bool IsOffscreen() = 0;
 
   // Swaps front and back buffers. This has no effect for off-screen
   // contexts.
   virtual bool SwapBuffers() = 0;
 
   // Get the size of the back buffer.
   virtual gfx::Size GetSize() = 0;
 
+  // Get the surface. TODO(apatrick): remove this when contexts are split from
+  // surfaces.
+  virtual GLSurface* GetSurface();
+
   // Get the underlying platform specific GL context "handle".
   virtual void* GetHandle() = 0;
 
   // Set swap interval. This context must be current.
   virtual void SetSwapInterval(int interval) = 0;
 
   // Returns the internal frame buffer object name if the context is backed by
   // FBO. Otherwise returns 0.
   virtual unsigned int GetBackingFrameBufferObject();
 
@@ skipping 23 matching lines @@
  protected:
   bool InitializeCommon();
 
  private:
   DISALLOW_COPY_AND_ASSIGN(GLContext);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_CONTEXT_H_