[sensors] Magnetometer sensor bindings implementation

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

Index: third_party/WebKit/Source/modules/sensor/MagnetometerReadingInit.idl
diff --git a/third_party/WebKit/Source/modules/sensor/MagnetometerReadingInit.idl b/third_party/WebKit/Source/modules/sensor/MagnetometerReadingInit.idl
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index 0000000000000000000000000000000000000000..35a262d84dd3d82e5e53be037fe920e815184660
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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/#dictdef-magnetometerreadinginit
+
+dictionary MagnetometerReadingInit {
+    unrestricted double x = 0;
+    unrestricted double y = 0;
+    unrestricted double z = 0;
+};