Pause for <video> should have immediate effect on audio

BUG=20351

A bug found while fixing mac audio. IPCAudioSouce transist to a
wrong state after Play() is called. Resulting to pause having
no effect. This will solve the problem of audio keeps playing
a while after it is paused.

Review URL: http://codereview.chromium.org/193095

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@26500 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed