Add Vibration API layout tests that inspect internal state.

LayoutTests/vibration/vibration-durations-expected.txt

Index: LayoutTests/vibration/vibration-durations-expected.txt
diff --git a/LayoutTests/vibration/vibration-durations-expected.txt b/LayoutTests/vibration/vibration-durations-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..bd98909118d7f38ea251c6f975ea3c50192c04f7
--- /dev/null
+++ b/LayoutTests/vibration/vibration-durations-expected.txt
@@ -0,0 +1,33 @@
+Tests for how durations are handled in the Vibration API.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS navigator.vibrate([]) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), []) is true
+PASS internals.isVibrating(document) is false
+PASS navigator.vibrate(0) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), []) is true
+PASS internals.isVibrating(document) is false
+PASS navigator.vibrate([0]) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), []) is true
+PASS internals.isVibrating(document) is false
+PASS navigator.vibrate(10000) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), [10000]) is true
+PASS internals.isVibrating(document) is true
+PASS navigator.vibrate(10001) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), [10000]) is true
+PASS internals.isVibrating(document) is true
+PASS navigator.vibrate([10001, 10001, 10001]) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), [10000, 10000, 10000]) is true
+PASS internals.isVibrating(document) is true
+PASS navigator.vibrate(-1) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), []) is true
+PASS internals.isVibrating(document) is false
+PASS navigator.vibrate([-1, -1, -1]) is true
+PASS areArraysEqual(internals.getVibrationPattern(document), [10000, 10000, 10000]) is true
+PASS internals.isVibrating(document) is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+