Added audio callback tests. This also puts in place a check and only runs the audio tests if audio devices are available on the machine. This means that were failing before on some platforms should no longer fail (they just won't be run).
BUG=none
TEST=Ran tests on various platforms. Ran trybots and checked that if tests ran, they succeeded.
Review URL: https://chromiumcodereview.appspot.com/10182008
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@137299 0039d316-1c4b-4281-b951-d872f2087c98
5 files changed
