Checkin a version of gmock, modified to use our boost_tuple in VS2005.

This checkin adds gmock, and a small example of how to write a gmock-based unittest.

Review URL: http://codereview.chromium.org/113807

git-svn-id: http://src.chromium.org/svn/trunk/src/build@16927 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

all.gyp

@@ -28,6 +28,7 @@
         '../printing/printing.gyp:*',
         '../sdch/sdch.gyp:*',
         '../skia/skia.gyp:*',
+        '../testing/gmock.gyp:*',
         '../testing/gtest.gyp:*',
         '../third_party/bzip2/bzip2.gyp:*',
         '../third_party/codesighs/codesighs.gyp:*',