GitLab

* Change UMA stats for capture startup to an enum. It retains the meanings of the current (bool) values 0 and 1.
* Add values for fail to create and open stream (device).
* Remove |enable_nodata_timer| which doesn't have any use.

BUG=399835

Review URL: https://codereview.chromium.org/460993002

Cr-Commit-Position: refs/heads/master@{#289288}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289288 0039d316-1c4b-4281-b951-d872f2087c98