Reland of V2 of //tools/binary_size rewrite (diffs).

tools/binary_size/function_signature_test.py

 #!/usr/bin/env python
 # Copyright 2017 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 logging
-import sys
 import unittest
 
 import function_signature
 
 
 class AnalyzeTest(unittest.TestCase):
 
   def testParseFunctionSignature(self):
     def check(ret_part, name_part, params_part, after_part=''):
       signature = ''.join((name_part, params_part, after_part))
@@ skipping 63 matching lines @@
     SIG = '(anonymous namespace)::Foo::Baz() const::GLSLFP::onData(Foo, Bar)'
     got_full, got_name = function_signature.Parse(SIG)
     self.assertEqual('(anonymous namespace)::Foo::Baz', got_name)
     self.assertEqual(SIG, got_full)
 
 
 if __name__ == '__main__':
   logging.basicConfig(level=logging.DEBUG,
                       format='%(levelname).1s %(relativeCreated)6d %(message)s')
   unittest.main()