...rotating to landscape
When doing spell checking in the same process as the spell checker, we
need to make sure it is still done asynchronously.
Putting this in I noticed quite a few threading issues in this code, so
I also addressed those (which became very obviously a problem with the
async stuff here now).
Also tweaked the service side to run spell checking at background priority.
Change-Id: I01bafe3bec6bceeca911d6bf2f61a486a2fd4c48
33b8ee509f