Add OVERRIDE to skia/.

skia/ext/bitmap_platform_device_mac.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 SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
 #define SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 23 matching lines @@
                                       bool is_opaque);
 
   // Creates a context for |data| and calls Create.
   static BitmapPlatformDevice* CreateWithData(uint8_t* data,
                                               int width, int height,
                                               bool is_opaque);
 
   virtual ~BitmapPlatformDevice();
 
   // PlatformDevice overrides
-  virtual CGContextRef GetBitmapContext();
+  virtual CGContextRef GetBitmapContext() OVERRIDE;
   virtual void DrawToNativeContext(CGContextRef context, int x, int y,
                                    const CGRect* src_rect) OVERRIDE;
 
   // SkDevice overrides
   virtual void setMatrixClip(const SkMatrix& transform, const SkRegion& region,
                              const SkClipStack&) OVERRIDE;
 
  protected:
   // Reference counted data that can be shared between multiple devices. This
   // allows copy constructors and operator= for devices to work properly. The
@@ skipping 15 matching lines @@
   // Data associated with this device, guaranteed non-null. We hold a reference
   // to this object.
   BitmapPlatformDeviceData* data_;
 
   DISALLOW_COPY_AND_ASSIGN(BitmapPlatformDevice);
 };
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_BITMAP_PLATFORM_DEVICE_MAC_H_