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The previous CL https://chromium-review.googlesource.com/570458
added a CHECK, but the messages are not preserved in production
builds. This adds the same info to a crash key, so we can get
info from the wild.

BUG=736675,744734

Change-Id: I97106eec9a6f4a4f2ab00d2a28e23f891ebe5e50
Reviewed-on: https://chromium-review.googlesource.com/575188
Commit-Queue: Alexei Svitkine (slow) <asvitkine@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487302}