GitLab

Add a new TrayBarButtonWithTitle class which can be used for both audio and brightness UI for toggle audio/brightness state.
Clip the extra empty space around left/right bar images so that the bar image would not have too much empty space around itself.
The new audio/brightness slider will be implemented in another cl.

BUG=122832
TEST=The new mute segment should show up and work on uber tray bubble.
TBR=oshima@chromium.org


Review URL: https://chromiumcodereview.appspot.com/10808080

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148002 0039d316-1c4b-4281-b951-d872f2087c98