[sensors] Magnetometer sensor bindings implementation

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

Index: third_party/WebKit/Source/modules/sensor/MagnetometerReading.idl
diff --git a/third_party/WebKit/Source/modules/sensor/MagnetometerReading.idl b/third_party/WebKit/Source/modules/sensor/MagnetometerReading.idl
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index 0000000000000000000000000000000000000000..c750fc7930ac4cc1b522f43667ea9f7f6c1d0873
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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-reading-interface
+
+[
+    RuntimeEnabled=Sensor,
+    Constructor(MagnetometerReadingInit magnetometerReadingInit)
+] interface MagnetometerReading : SensorReading {
+    readonly attribute unrestricted double x;
+    readonly attribute unrestricted double y;
+    readonly attribute unrestricted double z;
+};