Add google-endpoints to third_party/.

third_party/google-endpoints/future/backports/email/mime/nonmultipart.py

Index: third_party/google-endpoints/future/backports/email/mime/nonmultipart.py
diff --git a/third_party/google-endpoints/future/backports/email/mime/nonmultipart.py b/third_party/google-endpoints/future/backports/email/mime/nonmultipart.py
new file mode 100644
index 0000000000000000000000000000000000000000..08c37c36d128a613e62be352cfad02f6cab78cbb
--- /dev/null
+++ b/third_party/google-endpoints/future/backports/email/mime/nonmultipart.py
@@ -0,0 +1,24 @@
+# Copyright (C) 2002-2006 Python Software Foundation
+# Author: Barry Warsaw
+# Contact: email-sig@python.org
+
+"""Base class for MIME type messages that are not multipart."""
+from __future__ import unicode_literals
+from __future__ import division
+from __future__ import absolute_import
+
+__all__ = ['MIMENonMultipart']
+
+from future.backports.email import errors
+from future.backports.email.mime.base import MIMEBase
+
+
+class MIMENonMultipart(MIMEBase):
+    """Base class for MIME multipart/* type messages."""
+
+    def attach(self, payload):
+        # The public API prohibits attaching multiple subparts to MIMEBase
+        # derived subtypes since none of them are, by definition, of content
+        # type multipart/*
+        raise errors.MultipartConversionError(
+            'Cannot attach additional subparts to non-multipart/*')