Docserver: Make ObjectStore set calls return Futures

chrome/common/extensions/docs/server2/object_store.py

Index: chrome/common/extensions/docs/server2/object_store.py
diff --git a/chrome/common/extensions/docs/server2/object_store.py b/chrome/common/extensions/docs/server2/object_store.py
index 51dedd0641fc111282c55f59fc583665e7d53411..b56986b349ae0ea1b8bd9eb00d07a27954393f64 100644
--- a/chrome/common/extensions/docs/server2/object_store.py
+++ b/chrome/common/extensions/docs/server2/object_store.py
@@ -21,12 +21,14 @@ class ObjectStore(object):
     raise NotImplementedError(self.__class__)
 
   def Set(self, key, value):
-    '''Sets key -> value in the object store.
+    '''Sets key -> value in the object store. Returns a |Future| which is
+    resolved once the key's new value has been stored.
     '''
-    self.SetMulti({ key: value })
+    return self.SetMulti({ key: value })
 
   def SetMulti(self, items):
     '''Atomically sets the mapping of keys to values in the object store.
+    Returns a |Future| which is resolved once the new mapping has been stored.
     '''
     raise NotImplementedError(self.__class__)