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

include/core/SkDevice.h

Index: include/core/SkDevice.h
diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 078f7f531f48e3c1786d1332743af27ca1a130f6..e58a491563a7511cda871a01fb2e80fc229c870c 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -343,14 +343,14 @@ protected:
      *  PRIVATE / EXPERIMENTAL -- do not call
      *  Construct an acceleration object and attach it to 'picture'
      */
-    virtual void EXPERIMENTAL_optimize(SkPicture* picture);
+    virtual void EXPERIMENTAL_optimize(const SkPicture* picture);
 
     /**
      *  PRIVATE / EXPERIMENTAL -- do not call
      *  Purge all discardable optimization information for 'picture'. If
      *  picture is NULL then purge discardable information for all pictures.
      */
-    virtual void EXPERIMENTAL_purge(SkPicture* picture);
+    virtual void EXPERIMENTAL_purge(const SkPicture* picture);
 
     /**
      *  PRIVATE / EXPERIMENTAL -- do not call
@@ -362,7 +362,7 @@ protected:
      *  to perform some device-specific warm up tasks and then let SkCanvas
      *  perform the main rendering loop (by return false from here).
      */
-    virtual bool EXPERIMENTAL_drawPicture(SkCanvas* canvas, SkPicture* picture);
+    virtual bool EXPERIMENTAL_drawPicture(SkCanvas* canvas, const SkPicture* picture);
 
 private:
     friend class SkCanvas;