google-gflags is an open source command line parsing library for C++ that is useful for our test programs. 
The GYP file and the platform specific configurations in this CL is copied from the Page Speed project (http://code.google.com/p/page-speed) that also uses this library.
Review URL: http://webrtc-codereview.appspot.com/140009

git-svn-id: http://webrtc.googlecode.com/svn/trunk@569 4adac7df-926f-26a2-2b94-8c16560cd09d
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