Reland of [sensors] Ambient light sensor bindings implementation

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

Index: third_party/WebKit/Source/modules/sensor/AmbientLightSensorReading.idl
diff --git a/third_party/WebKit/Source/modules/sensor/AmbientLightSensorReading.idl b/third_party/WebKit/Source/modules/sensor/AmbientLightSensorReading.idl
new file mode 100644
index 0000000000000000000000000000000000000000..041e5cbf18f08b4380b05b348113315b940d2d30
--- /dev/null
+++ b/third_party/WebKit/Source/modules/sensor/AmbientLightSensorReading.idl
@@ -0,0 +1,13 @@
+// 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/#ambient-light-sensor-reading-interface
+
+[
+    RuntimeEnabled=Sensor,
+    Constructor(AmbientLightSensorReadingInit ambientLightSensorReadingInit)
+] interface AmbientLightSensorReading : SensorReading {
+    readonly attribute unrestricted double illuminance;
+};