Docs: Memoize the FeaturesBundles that are created by AvailabilityFinder to

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

Index: chrome/common/extensions/docs/server2/file_system.py
diff --git a/chrome/common/extensions/docs/server2/file_system.py b/chrome/common/extensions/docs/server2/file_system.py
index bb2bd9b76957ce828d7a2a0690e491bbac24b627..e21ff1e6a32f545c3bd2bada1a5690136d64832d 100644
--- a/chrome/common/extensions/docs/server2/file_system.py
+++ b/chrome/common/extensions/docs/server2/file_system.py
@@ -171,6 +171,13 @@ class FileSystem(object):
     for walkinfo in walk(root):
       yield walkinfo
 
+  def __eq__(self, other):
+    return (isinstance(other, FileSystem) and
+            self.GetIdentity() == other.GetIdentity())
+
+  def __ne__(self, other):
+    return not (self == other)
+
   def __repr__(self):
     return '<%s>' % type(self).__name__