Add percent and aggregate sorting on coverage report columns.

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

Change-Id: Icf8cc7df8b21e5a992d64f13c0cce1ec3acaecd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1584991
Reviewed-by: Max Moroz <mmoroz@chromium.org>
Commit-Queue: Abhishek Arya <inferno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#654229}
2 files changed