Enable mips in the test wrapper for gyp.

Review URL: http://codereview.chromium.org/8919002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10233 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

tools/test-wrapper-gypbuild.py

@@ -146,7 +146,7 @@ def ProcessOptions(options):
       print "Unknown mode %s" % mode
       return False
   for arch in options.arch:
-    if not arch in ['ia32', 'x64', 'arm']:
+    if not arch in ['ia32', 'x64', 'arm', 'mips']:
       print "Unknown architecture %s" % arch
       return False