Override SkCanvas::drawImage() in SkRecorder.

src/image/SkImage_Raster.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage_Base.h"
 #include "SkImagePriv.h"
 #include "SkBitmap.h"
@@ skipping 199 matching lines @@
         return NULL;
     }
     return SkNEW_ARGS(SkImage_Raster, (bitmap));
 }
 
 SkImage* SkNewImageFromPixelRef(const SkImageInfo& info, SkPixelRef* pr,
                                 size_t rowBytes) {
     return SkNEW_ARGS(SkImage_Raster, (info, pr, rowBytes));
 }
 
-SkPixelRef* SkBitmapImageGetPixelRef(SkImage* image) {
-    return ((SkImage_Raster*)image)->getPixelRef();
+const SkPixelRef* SkBitmapImageGetPixelRef(const SkImage* image) {
+    return ((const SkImage_Raster*)image)->getPixelRef();
 }
 
 bool SkImage_Raster::isOpaque() const {
     return fBitmap.isOpaque();
 }