Setting for large recent thumbnails

Change-Id: I17e530998ba7511ac2b75eed2a92d06a6eb188be

Conflicts:
	core/res/res/values-sw600dp/dimens.xml
	packages/SystemUI/res/values-sw600dp/dimens.xml
	packages/SystemUI/src/com/android/systemui/statusbar/BaseStatusBar.java
	policy/src/com/android/internal/policy/impl/GlobalActions.java
	services/java/com/android/server/am/ActivityStack.java