Move the apptest runner and parts of mopy to the public SDK.

mojo/tools/check_mojom_golden_files.py

 #!/usr/bin/env python
 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import argparse
 import os.path
 import sys
 from filecmp import dircmp
 from shutil import rmtree
 from tempfile import mkdtemp
+
+import add_sdk_tools_to_path
 from mopy.paths import Paths
 
 paths = Paths()
-
 sys.path.insert(0, os.path.join(paths.mojo_dir, "public", "tools", "bindings",
                                 "pylib"))
+
 from mojom_tests.support.find_files import FindFiles
 from mojom_tests.support.run_bindings_generator import RunBindingsGenerator
 
 
 def _ProcessDircmpResults(results, verbose=False):
   """Prints results of directory comparison and returns true if they are
   identical (note: the "left" directory should be the golden directory)."""
   rv = not (bool(results.left_only) or bool(results.right_only) or \
             bool(results.common_funny) or bool(results.funny_files) or \
             bool(results.diff_files))
@@ skipping 66 matching lines @@
   if not identical:
     print "FAILURE: current output differs from golden files"
     return 1
 
   print "SUCCESS: current output identical to golden files"
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())