Chrome Version:  65.0.3293.0

What steps will reproduce the problem?
(1) Flash a develop version ChromeOS  
(2) Installs Google Input Tool floating version from gs://chromeos-localmirror-private/distfiles/input-tools-6.8.0.7.tar.gz  
(3) Enter floating keyboard mode.  
(4) Open google xkb extension background page, in JS console, execute   chrome.virtualKeyboardPrivate.setDraggableArea({top:0, left:0, width: 0, height:0}),  

What is the expected result?
Setting draggable area to zero should disable drag feature. The floating keyboard can't be dragged any more.

What happens instead?
The floating keyboard still can be drag.

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