9d1ab88329
Now, each ViewGroup is tracking which of its child views [which might themselves be ViewGroups] is currently under the drag point, and when the drag leaves that child, a DRAG_EXITED is synthesized and dispatched all the way down to the leaf view previously under the point. ENTERED is still *not* dispatched down like this; instead, it's calculated and synthesized directly at each level based on the new LOCATION. The ViewRoot still tracks the leaf drag target, but solely for the purpose of reporting changes to the OS after full dispatch of a new LOCATION -- the entered/exited messaging is no longer initiated at the ViewRoot level. Change-Id: I0089cc538b7e33a0440187543fcfd2f8b12e197d