add serialprocs to MultiDocument, hide redundant methods

Bug: skia:
Change-Id: I6521e93af79439bd8c1d2f5130a68492044a2ee9
Reviewed-on: https://skia-review.googlesource.com/87788
Reviewed-by: Wei Li <weili@chromium.org>
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Mike Reed <reed@google.com>
diff --git a/bench/RecordingBench.cpp b/bench/RecordingBench.cpp
index dc82655..d23d4f4 100644
--- a/bench/RecordingBench.cpp
+++ b/bench/RecordingBench.cpp
@@ -107,8 +107,7 @@
 }
 
 void DeserializePictureBench::onDraw(int loops, SkCanvas*) {
-    SkDeserialProcs procs;
     for (int i = 0; i < loops; ++i) {
-        SkPicture::MakeFromData(fEncodedPicture, procs);
+        SkPicture::MakeFromData(fEncodedPicture.get());
     }
 }