Determine the number of CPUs in a POSIX-friendly way on UNIX. Also support OSX and Windows.
Determine the number of CPUs in a POSIX-friendly way on UNIX. Also support
OSX and Windows.

BUG=7942

Review URL: http://codereview.chromium.org/112015

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