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Show freeform button only when dev option is on
Now some Android tablets have desktop mode, which shouldn't be entered by clicking the freeform button in Overview. Therefore still keep it hidden when the device claims the support of freeform window management, but the user didn't enable the freeform dev options explicitly. This button should also be hidden when desktop mode is enabled. Bug: 299362754 Test: The button is hidden when the dev option is disabled. Change-Id: Id919af4fd1a027da0bb335c4c4b7303d15d689f8