Load All Apps before the workspace if All Apps is showing.

This change reorganizes the increasingly Byzantine loader
thread so that the order of (workspace, allapps) can be
reversed if the user is currently looking at the all apps
view. The perceptual improvement in performance is huge if
you change the Launcher's orientation while All Apps is
visible (which forces a reload/bind of everything); now that
AA doesn't have to wait behind the workspace it
(specifically, its first batch of icons) appears much, much
faster.

Bug: 2722977
Change-Id: I07a9afd5f1cff4019f2640b082872176ba0a887e
2 files changed