Pulling in gyp improvements.
Pulling in gyp improvements.

Review URL: http://codereview.chromium.org/115953

git-svn-id: http://src.chromium.org/svn/trunk/src@17251 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ef58efb85503010f7e8b43a98ebc080f6341c741
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser