Refactor common Pointer Lock test code to a harness.

https://bugs.webkit.org/show_bug.cgi?id=90813

Reviewed by Adrienne Walker.

* pointer-lock/bug90391-move-then-window-open-crash-expected.txt:
* pointer-lock/bug90391-move-then-window-open-crash.html:
* pointer-lock/lock-already-locked-expected.txt:
* pointer-lock/lock-already-locked.html:
* pointer-lock/lock-fail-responses-expected.txt:
* pointer-lock/lock-fail-responses.html:
* pointer-lock/mouse-event-delivery-expected.txt:
* pointer-lock/mouse-event-delivery.html:
* pointer-lock/pointer-lock-api-expected.txt:
* pointer-lock/pointer-lock-api.html:
* pointer-lock/pointerlockchange-pointerlockerror-events-expected.txt:
* pointer-lock/pointerlockchange-pointerlockerror-events.html:
* pointer-lock/pointerlocklost-event-expected.txt:
* pointer-lock/pointerlocklost-event.html:
* pointer-lock/resources/pointer-lock-test-harness.js: Added.
(doNextStep.else):
(doNextStepWithUserGesture):
(eventExpected.targetHanderNode.eventHandlerName):
(eventExpected):
(expectOnlyChangeEvent):
(expectOnlyErrorEvent):
(expectNoEvents):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122158 268f45cc-cd09-0410-ab3c-d52691b4dbfc