Add equivalent functionality from the current hammer build to the gyp-generated *_main.scons files: * Default -j setting:  number of cpus + 1. * PROGRESS= setting to display build progress messages. * Better comment explaning the --configuration option. Review URL: http://codereview.chromium.org/42530
Add equivalent functionality from the current hammer build to
the gyp-generated *_main.scons files:
* Default -j setting:  number of cpus + 1.
* PROGRESS= setting to display build progress messages.
* Better comment explaning the --configuration option.
Review URL: http://codereview.chromium.org/42530

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