duplicate the webrtc content_browser tests and browser tests with --enable-audio-track-processing on


NOTRY=true

BUG=264611
TEST=bots

Review URL: https://codereview.chromium.org/194713010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@256834 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 256834