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Compared to the original CL, this one fixes (in the second patch set) a
bug in PendingIvalidation.encodeToString() that caused frequent
NullPointerException crashes on canary. A corresponding unit-test is
added.

Bug: 782237
Change-Id: Ia2eacd4bc71122e4b3ca721b44f2b4472530861a
Reviewed-on: https://chromium-review.googlesource.com/970341Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547691}