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Update mEndRect when closing ArrowPopup
Generally mEndRect is still correct from when we set it in animateOpen(), but there are cases where it is no longer valid and should be recomputed in animateClose(). For example, if you dismiss notifications, the height of the popup changes between opening and closing it. Test: Long press an icon with a notification dot, dismiss all notifications from the popup and then close the popup. The shadow follows the outline of the popup, instead of extending well below it. Change-Id: Ic5d6ad2807ea1ec8aff5e3d6ce8abaa11ce5d33c