[Sensors] Align sensor reading attribute implementation with the specification

content/test/data/generic_sensor/ambient_light_sensor_test.html

Index: content/test/data/generic_sensor/ambient_light_sensor_test.html
diff --git a/content/test/data/generic_sensor/ambient_light_sensor_test.html b/content/test/data/generic_sensor/ambient_light_sensor_test.html
index 346bfc14b22ca04dd1421a2c0c5c74ca3793869d..9453eab723dfbc80f14c6f850edb86409acb6562 100644
--- a/content/test/data/generic_sensor/ambient_light_sensor_test.html
+++ b/content/test/data/generic_sensor/ambient_light_sensor_test.html
@@ -3,10 +3,11 @@
     <title>AmbientLight Generic Sensor test</title>
     <script type="text/javascript">
       var timeOrigin;
+      var sensor;
       function onAmbientLightReadingChange(event) {

[timvolodine, 2016/11/07 15:49:19]

what's the event here? SensorReadingEvent has been removed right?

[Mikhail, 2016/11/08 09:09:15]

indeed, thanks for the catch!

-        if (event.reading.illuminance == 50 &&
-            event.reading.timeStamp > timeOrigin &&
-            event.reading.timeStamp < window.performance.now()) {
+        if (sensor.reading.illuminance == 50 &&
+            sensor.reading.timeStamp > timeOrigin &&
+            sensor.reading.timeStamp < window.performance.now()) {
           pass();
         } else {
           fail();
@@ -14,7 +15,7 @@
       }
 
       function start() {
-        var sensor = new AmbientLightSensor();
+        sensor = new AmbientLightSensor();
         timeOrigin = window.performance.now();
         sensor.onchange = function(e) {
             onAmbientLightReadingChange(e);