Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/tests/legacy_naming/test.py

 #!/usr/bin/env python
 # Copyright 2015 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
 import subprocess
 import sys
 
 script_dir = os.path.dirname(os.path.realpath(__file__))
-tool_dir = os.path.abspath(os.path.join(script_dir, '../../pylib'))
+tool_dir = os.path.abspath(os.path.join(script_dir, '../../../pylib'))
 sys.path.insert(0, tool_dir)
 
 from clang import plugin_testing
 
 
 class BlinkGcPluginTest(plugin_testing.ClangPluginTest):
   """Test harness for the Blink GC plugin."""
 
   def AdjustClangArguments(self, clang_cmd):
     clang_cmd.append('-Wno-inaccessible-base')
 
   def ProcessOneResult(self, test_name, actual):
     # Some Blink GC plugins dump a JSON representation of the object graph, and
     # use the processed results as the actual results of the test.
     if os.path.exists('%s.graph.json' % test_name):
       try:
         actual = subprocess.check_output(
-            ['python', '../process-graph.py', '-c',
+            ['python', '../../process-graph.py', '-c',
              '%s.graph.json' % test_name],
             stderr=subprocess.STDOUT)
       except subprocess.CalledProcessError, e:
         # The graph processing script returns a failure exit code if the graph
         # is bad (e.g. it has a cycle). The output still needs to be captured in
         # that case, since the expected results capture the errors.
         actual = e.output
       finally:
         # Clean up the .graph.json file to prevent false passes from stale
         # results from a previous run.
@@ skipping 16 matching lines @@
   return BlinkGcPluginTest(
       os.path.dirname(os.path.realpath(__file__)),
       args.clang_path,
       args.plugin_path,
       'blink-gc-plugin',
       args.reset_results).Run()
 
 
 if __name__ == '__main__':
   sys.exit(main())