Implement DeviceLight

LayoutTests/fast/dom/DeviceLight/script-tests/null-values.js

Index: LayoutTests/fast/dom/DeviceLight/script-tests/null-values.js
diff --git a/LayoutTests/fast/dom/DeviceLight/script-tests/null-values.js b/LayoutTests/fast/dom/DeviceLight/script-tests/null-values.js
new file mode 100644
index 0000000000000000000000000000000000000000..2c491be2abff20e1a08529b329f87607a0ba00d0
--- /dev/null
+++ b/LayoutTests/fast/dom/DeviceLight/script-tests/null-values.js
@@ -0,0 +1,62 @@
+description('Tests using null values for some or all of the event properties.');
+
+var mockEvent;
+function setMockLight(lightValue) {
+
+    mockEvent = {value: lightValue};
+
+    if (window.testRunner)
+        testRunner.setMockDeviceLight(null != mockEvent.value, null == mockEvent.value ? 0 : mockEvent.value);
+    else
+        debug('This test can not be run without the TestRunner');
+}
+
+
+var deviceLightEvent;
+function checkLight(event) {
+    deviceLightEvent = event;
+    shouldBe('deviceLightEvent.value', 'mockEvent.value');
+}
+
+function firstListener(event) {
+    checkLight(event);
+    window.removeEventListener('devicelight', firstListener);
+    setTimeout(function(){initSecondListener();}, 0);
+}
+
+function initSecondListener() {
+    setMockLight(20);
+    window.addEventListener('devicelight', secondListener);
+}
+
+function secondListener(event) {
+    checkLight(event);
+    window.removeEventListener('devicelight', secondListener);
+    setTimeout(function(){initThirdListener();}, 0);
+}
+
+function initThirdListener() {
+    setMockLight(30);
+    window.addEventListener('devicelight', thirdListener);
+}
+
+function thirdListener(event) {
+    checkLight(event);
+    window.removeEventListener('devicelight', thirdListener);
+    setTimeout(function(){initFourthListener();}, 0);
+}
+
+function initFourthListener() {
+    setMockLight(40);
+    window.addEventListener('devicelight', fourthListener);
+}
+
+function fourthListener(event) {
+    checkLight(event);
+    finishJSTest();
+}
+
+setMockLight(50);
+window.addEventListener('devicelight', firstListener);
+
+window.jsTestIsAsync = true;