GitLab

HttpCache.ParallelWritingPattern histogram's 0 enum value is actually
a valid value and not undefined. This CL fixes the description and adds
tests for testing the 0 value.

Bug: 472740
Change-Id: Iac4cdb38b6141221e901003e3540c60228626400
Reviewed-on: https://chromium-review.googlesource.com/820191Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Commit-Queue: Shivani Sharma <shivanisha@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523526}