This is done by adding a whitespace before the last underscore on
strings above length 25, which should only affect the _unittest and
_integrationtest suffixes for our tests, that are the widest unwrappable
strings in our waterfall display.
I also removed all reduntant use of ShellCommand in favour for the
AddCommonStep function (that wraps the description text).
Also fixed so Mac tests are not halting the build.
Cleaned up some code style formatting.
BUG=
TEST=
Review URL: https://webrtc-codereview.appspot.com/400005
git-svn-id: http://webrtc.googlecode.com/svn/trunk@1735 4adac7df-926f-26a2-2b94-8c16560cd09d
