David Stevens 4693956388 Compute the focused window in display focus order
A WindowContainer's children are sorted so the focused child is at the
end of the list, so RootWindowContainer needs to iterate from end to
start when looking for the focused window.

Bug: 36590788
Test: DisplayContentTests#testFocusedWindowMultipleDisplays
Change-Id: I56e6b7d2054bc1e74b54a4f99706a08d278fa2e1
2017-03-27 11:07:22 -07:00
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