GitLab

[Coverage] Restrict code coverage script to target_os - linux, mac.

Also, improve documentation.

R=mmoroz@chromium.org,liaoyuke@chromium.org

Bug: 
Change-Id: Ic248caf2e7e73d84e29e8ce32689b7bfcd374e16
Reviewed-on: https://chromium-review.googlesource.com/809288
Commit-Queue: Abhishek Arya <inferno@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521739}