Activating Network Traffic Annotation Tests.

A test is added to the trybots to check network traffic annotation's
syntax, coverage, and other probable errors.

Bug: 656607
Bug: 690323
Change-Id: Idf7a987fd5e75713a03421e8c7cb0b9c5caeaf55
Reviewed-on: https://chromium-review.googlesource.com/704735
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516268}
5 files changed