Summary:
DecorView owns a BitmapPool to take snapshots of the view. These snapshots are later on serialised by the manager.
There's a couple of unrelated changes in this diff but that were already in place making it hard to split.
(1) Renamed 'traverseAndSend' to 'processUpdate'. Why?
The observers as a whole shouldn't necessary know that their 'observation' is being sent to any place. Future changes should move the send logic altogether from the observer too. But that can be made within the scope of a different diff.
(2) There was a bug for nodes that were being observed but then unsubscribed from. If the nodes were being marked for observation and observer was already into place, these were not being told to subscribe again for changes.
Reviewed By: LukeDefeo
Differential Revision: D39812943
fbshipit-source-id: af98c5caf54e1c69f97043bae95049395a2e4545
433061d377