[api] Make sure InterceptorInfo is always in a verifyable state.

[api] Make sure InterceptorInfo is always in a verifyable state.

This should fix the Threading1 flakiness that we see on the waterfall.

R=jarin@chromium.org

Committed: https://crrev.com/39114da1a76742395d1791e0691fe137f366779e
Cr-Commit-Position: refs/heads/master@{#30967}

[Benedikt Meurer, 2015-09-28 08:27:44]

Jaro: PTAL
Michael, Michael: FYI

[Jarin, 2015-09-28 08:28:53]

lgtm

[Benedikt Meurer, 2015-09-28 08:36:29]

The CQ bit was checked by bmeurer@chromium.org

[commit-bot: I haz the power, 2015-09-28 08:36:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1369993002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1369993002/1

[Michael Achenbach, 2015-09-28 08:37:25]

\o/ if it does!

[commit-bot: I haz the power, 2015-09-28 09:02:37]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-09-28 09:02:49]

Patchset 1 (id:??) landed as
https://crrev.com/39114da1a76742395d1791e0691fe137f366779e
Cr-Commit-Position: refs/heads/master@{#30967}