Add Vibration API layout tests that inspect internal state.

LayoutTests/vibration/vibration-exceptions-expected.txt

Index: LayoutTests/vibration/vibration-exceptions-expected.txt
diff --git a/LayoutTests/vibration/vibration-exceptions-expected.txt b/LayoutTests/vibration/vibration-exceptions-expected.txt
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+Tests that bad input throws exceptions in the Vibration API.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS navigator.vibrate(); threw exception TypeError: Failed to execute 'vibrate' on 'Navigator': 1 argument required, but only 0 present..
+PASS navigator.vibrate(1, 2); threw exception TypeError: Type error.
+PASS navigator.vibrate([1], [2]); threw exception TypeError: Type error.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+