GitLab

Flush() already accomplishes pausing by releasing all data and not
reading until Preroll() is called.

BUG=110814

Review URL: https://codereview.chromium.org/271923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@269675 0039d316-1c4b-4281-b951-d872f2087c98