Update bench to be able to preprocess skps

include/core/SkCanvas.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkCanvas_DEFINED
 #define SkCanvas_DEFINED
 
@@ skipping 914 matching lines @@
                                 const SkPaint& paint);
 
     /** PRIVATE / EXPERIMENTAL -- do not call
         Perform back-end analysis/optimization of a picture. This may attach
         optimization data to the picture which can be used by a later
         drawPicture call.
         @param picture The recorded drawing commands to analyze/optimize
     */
     void EXPERIMENTAL_optimize(SkPicture* picture);
 
+    /** PRIVATE / EXPERIMENTAL -- do not call
+        Purge all the discardable optimization information associated with
+        'picture'. If NULL is passed in, purge all discardable information.
+    */
+    void EXPERIMENTAL_purge(SkPicture* picture);
+
     /** Draw the picture into this canvas. This method effective brackets the
         playback of the picture's draw calls with save/restore, so the state
         of this canvas will be unchanged after this call.
         @param picture The recorded drawing commands to playback into this
                        canvas.
     */
     virtual void drawPicture(SkPicture& picture);
 
     enum VertexMode {
         kTriangles_VertexMode,
@@ skipping 484 matching lines @@
     bool asROBitmap(SkBitmap*) const;
 
 private:
     SkBitmap    fBitmap;    // used if peekPixels() fails
     const void* fAddr;      // NULL on failure
     SkImageInfo fInfo;
     size_t      fRowBytes;
 };
 
 #endif