Currently we force the tests to run in serial by repeating the invoke of the unittest command in the Run All Tests target and again in the All:Run All Tests.  This removes that and adds an xcode generator flag that forces test to run in serial.  The serial part is done by a few lines of python that result in only one being able to run at a time (like the linux flock command does).
Currently we force the tests to run in serial by repeating the invoke of the unittest command in the Run All Tests target and again in the All:Run All Tests.  This removes that and adds an xcode generator flag that forces test to run in serial.  The serial part is done by a few lines of python that result in only one being able to run at a time (like the linux flock command does).

TEST=all still works
BUG=none
Review URL: http://codereview.chromium.org/384090

csulmone/gyp,csulmone/gyp,csulmone/gyp,csulmone/gyp