Sketch splitting SkPicture into an interface and SkBigPicture.

include/utils/SkPictureUtils.h

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPictureUtils_DEFINED
 #define SkPictureUtils_DEFINED
 
 #include "SkPicture.h"
 
+// TODO: remove this file?
+
 class SK_API SkPictureUtils {
 public:
     /**
      *  How many bytes are allocated to hold the SkPicture.
      *  Includes operations, parameters, bounding data, deletion listeners;
      *  includes nested SkPictures, but does not include large objects that
      *  SkRecord holds a reference to (e.g. paths, or pixels backing bitmaps).
      */
-    static size_t ApproximateBytesUsed(const SkPicture* pict);
+    static size_t ApproximateBytesUsed(const SkPicture* pict) {
+        return pict->approximateBytesUsed();
+    }
 };
 
 #endif