Add google-endpoints to third_party/.

third_party/google-endpoints/future/moves/tkinter/tix.py

Index: third_party/google-endpoints/future/moves/tkinter/tix.py
diff --git a/third_party/google-endpoints/future/moves/tkinter/tix.py b/third_party/google-endpoints/future/moves/tkinter/tix.py
new file mode 100644
index 0000000000000000000000000000000000000000..019df6f73f8fa3d683ca7a3b18a8a23c95f33c39
--- /dev/null
+++ b/third_party/google-endpoints/future/moves/tkinter/tix.py
@@ -0,0 +1,13 @@
+from __future__ import absolute_import
+
+from future.utils import PY3
+
+if PY3:
+    from tkinter.tix import *
+else:
+    try:
+        from Tix import *
+    except ImportError:
+        raise ImportError('The Tix module is missing. Does your Py2 '
+                          'installation include tkinter?')
+