We now tell the system bar every time the top activity has changed for
it to re-evaluate its UI state.
Also fix issue #: 4607102 Low rider notifications. It turns out this
was due to the change in the dialog asset; the notification UI was relying
on this having a lot of padding to make it sit above the status bar.
Now we have an explicitly mechanism to set how much it overlaps (or doesn't)
the status bar.
Change-Id: Iab5ebd86e620ff4fc4cd77206e18af962ec2830e
Summary of changes:
Switched to using a ListView to contain recent apps.
Increased DISPLAY_TASKS to show up to 20 recent applications.
Moved some parameters to dimens to make them more customizeable
by partners and by device and configuration.
Adjusted size of composited thumbnail to accomodate new thumbnail
background asset.
Hide IME buttons in TabletStatusBar while RecentApps panel is showing.
Use new drawable for selection.
Restore list position on orientation change.
Change-Id: If8c26869b7e70f82c097870c6c1b928b959a4685
