Add Vibration API layout tests that inspect internal state.

LayoutTests/vibration/vibration-patterns-expected.txt

Index: LayoutTests/vibration/vibration-patterns-expected.txt
diff --git a/LayoutTests/vibration/vibration-patterns-expected.txt b/LayoutTests/vibration/vibration-patterns-expected.txt
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+++ b/LayoutTests/vibration/vibration-patterns-expected.txt
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+Tests for how patterns are handled in the Vibration API.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS navigator.vibrate(newPattern(1, 4)) is true
+PASS areArraysEqual(internals.pendingVibrationPattern(document), newPattern(1, 3)) is true
+PASS internals.isVibrating(document) is true
+PASS navigator.vibrate(newPattern(1, 99)) is true
+PASS areArraysEqual(internals.pendingVibrationPattern(document), newPattern(1, 99)) is true
+PASS internals.isVibrating(document) is true
+PASS navigator.vibrate(newPattern(1, 200)) is true
+PASS areArraysEqual(internals.pendingVibrationPattern(document), newPattern(1, 99)) is true
+PASS internals.isVibrating(document) is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+