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Also adds a test, and a --logcat flag for better matching of logcat
lines.

Bug: 713710
Change-Id: Ie21030b3c4e68d02cfb2e0d65d2c4c4f00624a80
Reviewed-on: https://chromium-review.googlesource.com/657265Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501535}