Detect when the user is in a consistent signin state and migrate them at that time.
This must take multiprofile into account: either migrate each profile independently (preferred), or wait until all profiles are consistent before migrating.
We can probably close this in the context of M3.
The current migration strategy is not very aggressive, and we may want to improve it. This can be done later in another bug though, once we have more data from the field and see how quickly people migrate.
Closing this for now.
Comment 1 by bugdroid1@chromium.org
, Oct 20 2017