Fixed issue with artifacts during scale-up transition animation

It is possible to get some artifacts during scale-up transition
animation of some fullscreen activities like Chrome. This is
caused by the clip rect specified by the transformation extending
outside the sys decor rect. We now contain the clip rect within
the system decor rect.

Also note that we don't want to do this for none-fullscreen
activities as it might cause some premature clipping.

Bug: 22830775
Bug: 21727851
Bug: 20652683
Bug: 19523205
Bug: 15046646
https://code.google.com/p/android/issues/detail?id=161362

Change-Id: I33827caaa256ad8fdc0eb3650ef34e95c48a6988