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

include/gpu/SkGpuDevice.h

Index: include/gpu/SkGpuDevice.h
diff --git a/include/gpu/SkGpuDevice.h b/include/gpu/SkGpuDevice.h
index f2a27d7bf50c2e73546b5f2fba5ee6a14f24e4c6..c9650d618483bad28f215944b40fa39b2e01f97e 100644
--- a/include/gpu/SkGpuDevice.h
+++ b/include/gpu/SkGpuDevice.h
@@ -152,11 +152,11 @@ protected:
     virtual bool onWritePixels(const SkImageInfo&, const void*, size_t, int, int) SK_OVERRIDE;
 
     /**  PRIVATE / EXPERIMENTAL -- do not call */
-    virtual void EXPERIMENTAL_optimize(SkPicture* picture) SK_OVERRIDE;
+    virtual void EXPERIMENTAL_optimize(const SkPicture* picture) SK_OVERRIDE;
     /**  PRIVATE / EXPERIMENTAL -- do not call */
-    virtual void EXPERIMENTAL_purge(SkPicture* picture) SK_OVERRIDE;
+    virtual void EXPERIMENTAL_purge(const SkPicture* picture) SK_OVERRIDE;
     /**  PRIVATE / EXPERIMENTAL -- do not call */
-    virtual bool EXPERIMENTAL_drawPicture(SkCanvas* canvas, SkPicture* picture) SK_OVERRIDE;
+    virtual bool EXPERIMENTAL_drawPicture(SkCanvas* canvas, const SkPicture* picture) SK_OVERRIDE;
 
 private:
     GrContext*      fContext;