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

src/gpu/GrLayerCache.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrLayerCache_DEFINED
 #define GrLayerCache_DEFINED
 
@@ skipping 84 matching lines @@
 // and one GrPlot (for the entire atlas). As such, the GrLayerCache
 // roughly combines the functionality of the GrFontCache and GrTextStrike
 // classes.
 class GrLayerCache {
 public:
     GrLayerCache(GrGpu*);
     ~GrLayerCache();
 
     void freeAll();
 
-    GrCachedLayer* findLayerOrCreate(SkPicture* picture, int id);
+    GrCachedLayer* findLayerOrCreate(const SkPicture* picture, int id);
 
 private:
     SkAutoTUnref<GrGpu>       fGpu;
     SkAutoTDelete<GrAtlasMgr> fAtlasMgr; // TODO: could lazily allocate
 
     class PictureLayerKey;
     GrTHashTable<GrCachedLayer, PictureLayerKey, 7> fLayerHash;
     GrTAllocPool<GrCachedLayer> fLayerPool;
 
     void init();
-    GrCachedLayer* createLayer(SkPicture* picture, int id);
+    GrCachedLayer* createLayer(const SkPicture* picture, int id);
 
 };
 
 #endif