Add google-endpoints to third_party/.

third_party/google-endpoints/tkinter/__init__.py

Index: third_party/google-endpoints/tkinter/__init__.py
diff --git a/third_party/google-endpoints/tkinter/__init__.py b/third_party/google-endpoints/tkinter/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..d0e1b0afec9c3f0f3d952ab80d628b9ce6bf7ff1
--- /dev/null
+++ b/third_party/google-endpoints/tkinter/__init__.py
@@ -0,0 +1,12 @@
+from __future__ import absolute_import
+import sys
+
+if sys.version_info[0] < 3:
+    from Tkinter import *
+    from Tkinter import (_cnfmerge, _default_root, _flatten, _join, _setit,
+                         _splitdict, _stringify, _support_default_root, _test,
+                         _tkinter)
+else:
+    raise ImportError('This package should not be accessible on Python 3. '
+                      'Either you are trying to run from the python-future src folder '
+                      'or your installation of python-future is corrupted.')