Install a hook to swap between SkPicture backends with a single define.

src/core/SkPicture.cpp

Index: src/core/SkPicture.cpp
diff --git a/src/core/SkPicture.cpp b/src/core/SkPicture.cpp
index 515f28d0791097f1df693e11606151bd82d7c0c9..d1a81a5aff345c4439e163d98959ac9c9db2e80a 100644
--- a/src/core/SkPicture.cpp
+++ b/src/core/SkPicture.cpp
@@ -279,7 +279,8 @@ SkPicture::SkPicture(int width, int height,
 // This for compatibility with serialization code only.  This is not cheap.
 static SkPicture* backport(const SkRecord& src, int width, int height) {
     SkPictureRecorder recorder;
-    SkRecordDraw(src, recorder.beginRecording(width, height), NULL/*bbh*/, NULL/*callback*/);
+    SkRecordDraw(src,
+                 recorder.DEPRECATED_beginRecording(width, height), NULL/*bbh*/, NULL/*callback*/);
     return recorder.endRecording();
 }