Generic Sensor API : Ambient Light Sensor API.

third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl

Index: third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl
diff --git a/third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl b/third_party/WebKit/Source/modules/sensor/SensorReadingEvent.idl
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index 0000000000000000000000000000000000000000..004c527ddbd89a5d6cd10a644563f97d659ea194
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+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Specification at:
+// https://w3c.github.io/sensors/#sensorreadingevent
+
+[
+    RuntimeEnabled=Sensor,
+    Constructor(DOMString type, SensorReadingEventInit eventInitDict)
+] interface SensorReadingEvent : Event {
+    readonly attribute SensorReading reading;
+};