Generic Sensor API : Ambient Light Sensor API.

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

Index: third_party/WebKit/Source/modules/sensor/AmbientLightSensor.idl
diff --git a/third_party/WebKit/Source/modules/sensor/AmbientLightSensor.idl b/third_party/WebKit/Source/modules/sensor/AmbientLightSensor.idl
new file mode 100644
index 0000000000000000000000000000000000000000..850f27514fd91e0a89bfe6aa0746d1b11fa6147e
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+++ b/third_party/WebKit/Source/modules/sensor/AmbientLightSensor.idl
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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/ambient-light/#idl-def-ambientlightsensor
+
+[
+    Exposed=(Window),
+    RuntimeEnabled=Sensor,
+    DependentLifetime,
+    Constructor(optional SensorOptions sensorOptions),
+    ConstructorCallWith=ExecutionContext,
+    RaisesException=Constructor,
+] interface AmbientLightSensor : Sensor {
+    readonly attribute AmbientLightSensorReading? reading;
+};