Close a Spinner dropdown if its anchor view goes away.
Close a Spinner dropdown if its anchor view goes away.

PopupWindow already tracks when anchor views scroll, but it doesn't
catch other layout changes.

Bug 7267264

Change-Id: I1e20f9335057832c78c3002aa931f533dd77514b

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base