By moving loading in each controller to the same thread.
There will still be shifting as the conversation prefs are added, but it
won't be the over thte top shift up and shift down motion that existed
prior to this cl.
Test: manual
Fixes: 188734400
Change-Id: I202981b603b8f9308b2b352a0939182910869cd6
Since the button for clearing recent conversations may still
exist after the user triggers the button since some of the
conversations might not be removable
Test: manual with talkback
Fixes: 185433664
Change-Id: Id58d76237643e4e206ea6d551cdf7dd9f5742282
- Don't show the button if nothing is clearable
- Optimistically remove preferences on pressing clear since the actualy
clear action is asynchronous
Test: RoboTests
Fixes: 178765511
Change-Id: Ic305d4d199b149078ea52a614cb93cebe55cd245
