Adding release method to SkWriter32 and using it to not copy the ops data from SkPictureRecord to S…

src/core/SkPictureRecord.h

Index: src/core/SkPictureRecord.h
diff --git a/src/core/SkPictureRecord.h b/src/core/SkPictureRecord.h
index 6d14c621aafb510dd5e13a6f01fa50f866c19992..f683ceb50f2b39de2571999d8c010a9e66a371fb 100644
--- a/src/core/SkPictureRecord.h
+++ b/src/core/SkPictureRecord.h
@@ -99,7 +99,7 @@ public:
         fRecordFlags = recordFlags;
     }
 
-    const SkWriter32& writeStream() const {
+    SkWriter32& writeStream() {
         return fWriter;
     }