4d6d57690e
This also removes one bit of magic to make it more obvious what on is going on during a sync, which should hopefully help. Components have to decide if they support being stateful or not. If they do, then they must implement syncFields() and have mutable fields; if they don't, then they must have final fields. This isn't particularly enforced, though. This also renames _willSync() to _retainStatefulNodeIfPossible(), for clarity, and fixes some minor style issues and one typo that was breaking the drawer. R=abarth@chromium.org Review URL: https://codereview.chromium.org/1174023003