Move grit from DEPS into src.

tools/grit/grit.py

Index: tools/grit/grit.py
diff --git a/google_apis/build/check_internal.py b/tools/grit/grit.py
similarity index 54%
copy from google_apis/build/check_internal.py
copy to tools/grit/grit.py
index da0ddae8052acda9ea4d3179e4216e0888eaf6b0..b17ceb9280bcbcf70a650f6e86c432a3b6c85ee1 100755
--- a/google_apis/build/check_internal.py
+++ b/tools/grit/grit.py
@@ -3,18 +3,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-"""google_api's auto-internal gyp integration.
+'''Bootstrapping for GRIT.
+'''
 
-Takes one argument, a path.  Prints 1 if the path exists, 0 if not.
-"""
-
-
-import os
 import sys
 
+import grit.grit_runner
+
 
 if __name__ == '__main__':
-  if os.path.exists(sys.argv[1]):
-    print 1
-  else:
-    print 0
+  grit.grit_runner.Main(sys.argv[1:])
+