tree 59cb8b94495287c054e1db95720b7de9d0a4281e
parent a55aed19b3da4041bfe5669829a01bd6d5b5a3fe
author Yifei Teng <yifeit@google.com> 1547684061 -0800
committer CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org> 1547758550 +0000

[fidl] Implement decoder using visitor.

Migrates the FIDL decoder from buffer_walker to visitor.
There should be no external behavioral change.

+apang: I grafted your xunion implementation.

TEST: CQ, and tryjobs in higher layers
Change-Id: Id3e3a2c21acfaaea68eb4af7f09ff35c5a0adfd9