Added gsutil/gslib to depot_tools/third_party

third_party/gsutil/gslib/addlhelp/__init__.py

Index: third_party/gsutil/gslib/addlhelp/__init__.py
diff --git a/third_party/gsutil/gslib/addlhelp/__init__.py b/third_party/gsutil/gslib/addlhelp/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..5bd7ff979927da8d70986cc0114af8198594f3c1
--- /dev/null
+++ b/third_party/gsutil/gslib/addlhelp/__init__.py
@@ -0,0 +1,15 @@
+# Copyright 2012 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.
+
+"""Package marker file."""