Added experimental tilt and tiltDirection to the Touch interface

LayoutTests/fast/events/touch/touch-tilt.html

+<script src="../../../resources/js-test.js"></script> 
+
+<p id="description"></p>
+<div id="console"></div>
+<script type="text/javascript">
+description('Test verifies tilt and tiltDirection can be plumbed through correctly via eventSender');
+
+var touch = null;
+
+function onTouchEvent (event) {
+    shouldBeNull('touch');
+    touch = event.touches[0];
+}
+document.addEventListener('touchstart', onTouchEvent, false);
+document.addEventListener('touchmove' , onTouchEvent, false);
+
+if (window.eventSender) {
+    eventSender.clearTouchPoints();
+    eventSender.addTouchPoint(100, 100);
+    eventSender.touchStart();
+    touch = null;
+
+    eventSender.updateTouchPoint(0, 110, 110);
+    debug('Sending touchmove (1)');
+    eventSender.touchMove();
+    shouldBeNonNull('touch');
+    shouldBeNaN('touch.tilt');
+    shouldBeNaN('touch.tiltDirection');
+    touch = null;
+
+    eventSender.clearTouchPoints();
+    eventSender.touchEnd();
+    eventSender.addTouchPoint(100, 100);
+    if (eventSender.setTouchPointTilt)
+      eventSender.setTouchPointTilt(0, 15, 30, false);
+    eventSender.touchStart();
+    if (eventSender.setTouchPointTilt) {
+      shouldBe('touch.tilt', '15');
+      shouldBe('touch.tiltDirection', '30');
+    }
+    touch = null;
+
+    if (eventSender.setTouchPointTilt)
+      eventSender.setTouchPointTilt(0, 45, 60, true);
+    debug('Sending touchmove (2)');
+    eventSender.touchMove();
+    shouldBeNonNull('touch');
+    if (eventSender.setTouchPointTilt) {
+      shouldBe('touch.tilt', '45');
+      shouldBe('touch.tiltDirection', '60');
+    }
+    touch = null;
+} else {
+   debug('This test requires --dump-render-tree.');
+}
+
+</script>