Add OVERRIDE to gpu/ and gl/.

ui/gfx/gl/gl_surface_osmesa.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_OSMESA_H_
 #define UI_GFX_GL_GL_SURFACE_OSMESA_H_
 #pragma once
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/gl/gl_surface.h"
 #include "ui/gfx/size.h"
 
 namespace gfx {
 
 // A surface that the Mesa software renderer draws to. This is actually just a
 // buffer in system memory. GetHandle returns a pointer to the buffer. These
 // surfaces can be resized and resizing preserves the contents.
 class GL_EXPORT GLSurfaceOSMesa : public GLSurface {
  public:
   GLSurfaceOSMesa(unsigned format, const gfx::Size& size);
   virtual ~GLSurfaceOSMesa();
 
   // Resize the back buffer, preserving the old content. Does nothing if the
   // size is unchanged.
-  virtual bool Resize(const gfx::Size& new_size);
+  virtual bool Resize(const gfx::Size& new_size) OVERRIDE;
 
   // Implement GLSurface.
-  virtual bool Initialize();
-  virtual void Destroy();
-  virtual bool IsOffscreen();
-  virtual bool SwapBuffers();
-  virtual gfx::Size GetSize();
-  virtual void* GetHandle();
-  virtual unsigned GetFormat();
+  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;
+  virtual unsigned GetFormat() OVERRIDE;
 
  private:
   void AllocateBuffer(const Size& size);
 
   unsigned format_;
   gfx::Size size_;
   scoped_array<int32> buffer_;
 
   DISALLOW_COPY_AND_ASSIGN(GLSurfaceOSMesa);
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_GL_GL_SURFACE_OSMESA_H_