Generic Sensor API : Ambient Light Sensor API.

device/sensor/als_reading.mojom

Index: device/sensor/als_reading.mojom
diff --git a/device/sensor/als_reading.mojom b/device/sensor/als_reading.mojom
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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.
+
+module device;
+
+struct AmbientLightSensorReading {
+  // from Sensor
+  double timeStamp; // DOMHighResTimeStamp == double
+  // From ALS
+  double illuminance;
+};