GitLab

The video muting test didn't force iSAC correctly. Also added some
lightweight log statements to make it easier to see how far we get when
the test fails.

BUG=332765
TBR=wjia@chromium.org

Review URL: https://codereview.chromium.org/131613005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243904 0039d316-1c4b-4281-b951-d872f2087c98