Since adding a public api for the playground app was problematic,
we now keep track of onResume and onDestroy calls globally inside the
app. This fixes a few bugs in cases where tasks would be hidden from the
ActivityManger#.getAppTasks() method and allows us to listen for changes
allowing us to do without a periodic refresh of the UI.
Test: Manual
Change-Id: Idb834cbdc7aad6442dd962c95b5321e1d75695fe
This gives the user a clearer overview of the current state of the
application, without having to expand all the tasks.
Padding has been reduced to better utilize available screen space.
The bring to front and remove buttons are currently always hidden.
Test: Manual
Change-Id: Ifcda0ff31fd5adb89a12ff6a024842c0e7a7ab29
