Replace "hotseat" with "Favorites tray" in user visible strings.

Bug: 12078955
Change-Id: I824948d8820276caab18d6df095754a4cfb67640
Tightening migration conditions. (Bug 11973614)

Change-Id: I6d7417b705227472d035f428cbec933cc6dbf2ce
Tightening migration conditions. (Bug 11973614)

Change-Id: I6d7417b705227472d035f428cbec933cc6dbf2ce
(cherry picked from commit e43a1e788223ab5a4405c5eeb0133ff57efbc768)
Fix back button behavior for "App info" when launched by Launcher3.

Ensures the back stack is clean when opening the "App info" app from the launcher.

Bug: 10393223
Change-Id: Iad078ca37c4794a580f1b996f8324fef404e7462
rationalize launcher backup logging

enough data to debug dogfood issues
easy switch to move to quieter production mode
common switch across all three classes

Bug: 12545310
Change-Id: Icb4ad7174f20884c6993140149db590d66f6e006
Don't migrate shortcuts for components that no longer exist

Bug 12570791

Change-Id: Ie4b55afcee0c4d1d16acf7b830d7885800943454
Lazy load the widget preview loader class

Bug: 12109621

Change-Id: Id99aded30195bf39ebcf2148611bc4e084f3b2c7