Framework: Fix recents animation bug for all

Sometimes doing some other stuff bring ideas up to solve
problems. Google uses a dirty preload animation hack to
animate recents right....we can do the same just more
generalized.....due that all places (hw keys, navbar, SlimPie
and navring) are calling toggleRecents() I implemented the fix
now there to solve it in general. Due of that this commit
reverts commit 20a905c96c6a897226ad2e5a47c9c6b39a0ef040.
as well

cheers

Change-Id: I48aaa85881d8b177c7223a746bd39925f6826066

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/policy/ExtensibleKeyButtonView.java
Not needed anymore.