If the media element is explicitly muted in the DOM, we should not classify it as "playing audio". For example, there are websites that use a muted video to display an animated background, and that video element should be treated as "not playing audio". <rdar://problem/18644403>
Created attachment 244817 [details] Patch
Comment on attachment 244817 [details] Patch r=me
Thanks Andreas! Committed: http://trac.webkit.org/changeset/178655