- Adding support for an external search bar that can be used
to search a container view. This adds a new interface
AllAppsSearchController which manages the external search
bar. Each controller will have its own search implementation
which means that we no longer need a common AppSearchManager
interface.
- Removing elevation controller as we no longer have a builtin
search bar in all apps
- Refactoring container view insets so that they behave
the same in all containers.
- Refactoring apps view to ensure that we only update the number
of columns with the available width
- Cleaning up LauncherCallbacks interface
Bug: 20127840
Bug: 21494973
Change-Id: I710b8e18196961d77d8a29f0c345531d480936fe
