[telemetry] Move camel_case_converter out of chrome/ and use it for discover, as well.

tools/telemetry/telemetry/core/discover.py

Index: tools/telemetry/telemetry/core/discover.py
diff --git a/tools/telemetry/telemetry/core/discover.py b/tools/telemetry/telemetry/core/discover.py
index ece12f9fc9dabda095ded8114b8f711fa24241be..10cc73139b3e67b4f915d5e7338651b9ad5bdb86 100644
--- a/tools/telemetry/telemetry/core/discover.py
+++ b/tools/telemetry/telemetry/core/discover.py
@@ -1,11 +1,14 @@
 # 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 fnmatch
 import inspect
 import os
 import re
 
+from telemetry.core import camel_case
+
 
 def DiscoverModules(start_dir, top_level_dir, pattern='*'):
   """Discover all modules in |start_dir| which match |pattern|.
@@ -65,7 +68,7 @@ def DiscoverClasses(start_dir, top_level_dir, base_class, pattern='*',
       if (inspect.isclass(obj) and obj is not base_class and
           issubclass(obj, base_class)):
         if index_by_class_name:
-          key_name = re.sub('(?!^)([A-Z]+)', r'_\1', obj.__name__).lower()
+          key_name = camel_case.ToUnderscore(obj.__name__)
         else:
           key_name = module.__name__.split('.')[-1]
         classes[key_name] = obj