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

src/utils/SkProxyCanvas.cpp

Index: src/utils/SkProxyCanvas.cpp
diff --git a/src/utils/SkProxyCanvas.cpp b/src/utils/SkProxyCanvas.cpp
index 20f93071c015187763cd4d1cabeb007d40dc4c94..5cb54698f63d3fbedac031f288b7ae80a542eab0 100644
--- a/src/utils/SkProxyCanvas.cpp
+++ b/src/utils/SkProxyCanvas.cpp
@@ -136,7 +136,7 @@ void SkProxyCanvas::onDrawTextOnPath(const void* text, size_t byteLength, const
     fProxy->drawTextOnPath(text, byteLength, path, matrix, paint);
 }
 
-void SkProxyCanvas::drawPicture(SkPicture& picture) {
+void SkProxyCanvas::onDrawPicture(const SkPicture* picture) {
     fProxy->drawPicture(picture);
 }