Add a method to tab_utils.h to find out whether a tab is playing audio.


BUG=3541


Review URL: https://chromiumcodereview.appspot.com/11573066

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182364 0039d316-1c4b-4281-b951-d872f2087c98
10 files changed