HALO: keep apps in recents

Change-Id: I9ede8a1aba8d6721f077a39a31b6cc5cd8272dc2

Conflicts:
	services/java/com/android/server/am/ActivityRecord.java
Final fix for recent apps orientation

Besides the known showImpl (called every single time when recent apps is shown or hidden), Override onSizeChanged method for setting recent hints on orientation changes, and restore hints in onUiHidden method. The perfect match

Conflicts:
	packages/SystemUI/src/com/android/systemui/recent/RecentsActivity.java
	packages/SystemUI/src/com/android/systemui/recent/RecentsPanelView.java

Change-Id: Ieb9ccd076223d08df6e41ac62641f302d6708595