tree b5c87fc6e24bce1d8b8adf437d7dcb75fe8295c2
parent 641e1954b4c915611e5ea9d9ab871748443253ff
author Natalie Weizenbaum <nweiz@google.com> 1462822306 -0700
committer Natalie Weizenbaum <nweiz@google.com> 1462822306 -0700

Add APIs for asserting the types of transformers.

I thought about adding these to Delegating*Transformer classes, but
those delegates don't really make any sense at all on their own, so I
found other places instead.

R=lrn@google.com

Review URL: https://codereview.chromium.org//1947923003 .