Add a first test for tools/find_runtime_symbols.

tools/find_runtime_symbols/static_symbols.py

 # Copyright (c) 2012 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 bisect
-import os
 import re
-import sys
 
 
 _ARGUMENT_TYPE_PATTERN = re.compile('\([^()]*\)(\s*const)?')
 _TEMPLATE_ARGUMENT_PATTERN = re.compile('<[^<>]*>')
 _LEADING_TYPE_PATTERN = re.compile('^.*\s+(\w+::)')
 _READELF_SECTION_HEADER_PATTER = re.compile(
     '^\s*\[\s*(Nr|\d+)\]\s+(|\S+)\s+([A-Z_]+)\s+([0-9a-f]+)\s+'
     '([0-9a-f]+)\s+([0-9a-f]+)\s+([0-9]+)\s+([WAXMSILGxOop]*)\s+'
     '([0-9]+)\s+([0-9]+)\s+([0-9]+)')
 
@@ skipping 159 matching lines @@
             matched.group(7), # es
             matched.group(8), # flg
             matched.group(9), # lk
             matched.group(10), # inf
             matched.group(11) # al
             ))
       else:
         if line in ('Key to Flags:', 'Program Headers:'):
           break
 
-  def _parse_nm_bsd_line(self, line):
+  @staticmethod
+  def _parse_nm_bsd_line(line):
     if line[8] == ' ':
       return line[0:8], line[9], line[11:]
     elif line[16] == ' ':
       return line[0:16], line[17], line[19:]
     raise ParsingException('Invalid nm output.')
 
-  def _get_short_function_name(self, function):
+  @staticmethod
+  def _get_short_function_name(function):
     while True:
       function, number = _ARGUMENT_TYPE_PATTERN.subn('', function)
       if not number:
         break
     while True:
       function, number = _TEMPLATE_ARGUMENT_PATTERN.subn('', function)
       if not number:
         break
     return _LEADING_TYPE_PATTERN.sub('\g<1>', function)
 
@@ skipping 48 matching lines @@
       self._append_procedure(
           last_start, Procedure(last_start, start_val, routine))
 
       last_start = start_val
       routine = sym_name
 
     if not mangled:
       routine = self._get_short_function_name(routine)
     self._append_procedure(
         last_start, Procedure(last_start, last_start, routine))