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3/n Refactor TaskContainers to TaskDisplayArea
Renamed TaskContainers to TaskDisplayArea and added getDisplayArea() method to WindowContainer that finds the first display area in the hierarchy above the node. ActivityRecord and Task override it to return the TaskDisplayArea class. Bug: 152116619 Test: WM CTS and unit tests Change-Id: I4525afbcd794848e1020213cdca04d89a646dd55