app_list: Make min page switcher button width and spacing smaller.
- Change min button width from 44px to 28px;
- Change min button spacing from 18px to 4px;
Also add a 20px padding on left and right so that buttons are aligned with app
tiles instead of stretching all the way to the edges.
BUG=none.
TEST=Verify the UI could hold up to 11 page switcher buttons.
R=sky@chromium.org
Review URL: https://chromiumcodereview.appspot.com/
10910233
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156440 0039d316-1c4b-4281-b951-d872f2087c98