Add OVERRIDE to gpu/ and gl/.

ui/gfx/gl/gl_surface_cgl.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_SURFACE_CGL_H_
 #define UI_GFX_GL_GL_SURFACE_CGL_H_
 
 #include "ui/gfx/gl/gl_surface.h"
 #include "ui/gfx/size.h"
 
@@ skipping 12 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceCGL);
 };
 
 // A surface used to render to an offscreen pbuffer.
 class PbufferGLSurfaceCGL : public GLSurfaceCGL {
  public:
   explicit PbufferGLSurfaceCGL(const gfx::Size& size);
   virtual ~PbufferGLSurfaceCGL();
 
   // Implement GLSurface.
-  virtual bool Initialize();
-  virtual void Destroy();
-  virtual bool IsOffscreen();
-  virtual bool SwapBuffers();
-  virtual gfx::Size GetSize();
-  virtual void* GetHandle();
+  virtual bool Initialize() OVERRIDE;
+  virtual void Destroy() OVERRIDE;
+  virtual bool IsOffscreen() OVERRIDE;
+  virtual bool SwapBuffers() OVERRIDE;
+  virtual gfx::Size GetSize() OVERRIDE;
+  virtual void* GetHandle() OVERRIDE;
 
  private:
   gfx::Size size_;
   void* pbuffer_;
 
   DISALLOW_COPY_AND_ASSIGN(PbufferGLSurfaceCGL);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_CGL_H_