[sensors] Magnetometer sensor bindings implementation

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

Index: third_party/WebKit/Source/modules/sensor/Magnetometer.idl
diff --git a/third_party/WebKit/Source/modules/sensor/Magnetometer.idl b/third_party/WebKit/Source/modules/sensor/Magnetometer.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/magnetometer/#magnetometer-interface
+
+[
+    RuntimeEnabled=Sensor,
+    Constructor(optional SensorOptions sensorOptions),
+    ConstructorCallWith=ScriptState,
+    RaisesException=Constructor,
+] interface Magnetometer : Sensor {
+    readonly attribute MagnetometerReading? reading;
+};