multiwindow: correct actionbars, dynamic windowsize depending on screen and portrait/landscape

Change-Id: Iab8c70a8cce4b614019e07a3e1e280dc8f7c8005

Conflicts:
	core/java/android/app/Activity.java
Merge branch 'multiwindow' of bitbucket.org:paranoidandroid/aosp_frameworks_base into multiwindow