2011-03-22 Eric Seidel <eric@webkit.org>

        Reviewed by Adam Barth.

        Teach update-webkit about gyp
        https://bugs.webkit.org/show_bug.cgi?id=56881

        This makes it possible for someone who builds from Xcode
        to just run update-webkit --gyp and have the project files
        generated after update automatically.

        I also added a stand-alone "generate-project-files" script
        wrapping Source/gyp/configure.  This makes running gyp simpler
        since most people will not have gyp or Source/gyp in their path.

        * Scripts/build-webkit:
        * Scripts/generate-project-files: Added.
        * Scripts/update-webkit:

git-svn-id: svn://svn.chromium.org/blink/trunk@81735 bbb929c8-8fbe-4397-9dbb-9b2b20218538