Alter SkCanvas::drawPicture (devirtualize, take const SkPicture, take pointer)

src/utils/SkGatherPixelRefsAndRects.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkGatherPixelRefsAndRects.h"
 #include "SkNoSaveLayerCanvas.h"
 #include "SkPictureUtils.h"
 
 void SkPictureUtils::GatherPixelRefsAndRects(SkPicture* pict,
                                              SkPictureUtils::SkPixelRefContainer* prCont) {
     if (0 == pict->width() || 0 == pict->height()) {
         return ;
     }
 
     SkGatherPixelRefsAndRectsDevice device(pict->width(), pict->height(), prCont);
     SkNoSaveLayerCanvas canvas(&device);
 
     canvas.clipRect(SkRect::MakeWH(SkIntToScalar(pict->width()),
                                    SkIntToScalar(pict->height())),
                     SkRegion::kIntersect_Op, false);
-    canvas.drawPicture(*pict);
+    canvas.drawPicture(pict);
 }