Add gsutil 4.13 to telemetry/third_party

tools/telemetry/third_party/gsutil/gslib/tests/mock_logging_handler.py

Index: tools/telemetry/third_party/gsutil/gslib/tests/mock_logging_handler.py
diff --git a/tools/telemetry/third_party/gsutil/gslib/tests/mock_logging_handler.py b/tools/telemetry/third_party/gsutil/gslib/tests/mock_logging_handler.py
new file mode 100644
index 0000000000000000000000000000000000000000..f92208dd2fc00a894e1e6cbf72c03a7ef40061a5
--- /dev/null
+++ b/tools/telemetry/third_party/gsutil/gslib/tests/mock_logging_handler.py
@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*-
+# Copyright 2014 Google Inc. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+"""Mock logging handler to check for expected logs."""
+
+import logging
+
+
+class MockLoggingHandler(logging.Handler):
+  """Mock logging handler to check for expected logs."""
+
+  def __init__(self, *args, **kwargs):
+    self.reset()
+    logging.Handler.__init__(self, *args, **kwargs)
+
+  def emit(self, record):
+    self.messages[record.levelname.lower()].append(record.getMessage())
+
+  def reset(self):
+    self.messages = {
+        'debug': [],
+        'info': [],
+        'warning': [],
+        'error': [],
+        'critical': [],
+    }