[sensors] Magnetometer sensor bindings implementation

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

+// 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.
+
+#include "modules/sensor/MagnetometerReading.h"
+
+#include "modules/sensor/MagnetometerReadingInit.h"
+#include "wtf/CurrentTime.h"
+
+namespace blink {
+
+namespace {
+
+device::SensorReading ToReadingData(const MagnetometerReadingInit& init) {
+  device::SensorReading result;
+  result.timestamp = WTF::monotonicallyIncreasingTime();
+  if (init.hasX())
+    result.values[0] = init.x();
+  if (init.hasY())
+    result.values[1] = init.y();
+  if (init.hasZ())
+    result.values[2] = init.z();
+
+  return result;
+}
+
+}  // namespace
+
+MagnetometerReading::MagnetometerReading(const MagnetometerReadingInit& init)
+    : SensorReading(ToReadingData(init)) {}
+
+MagnetometerReading::MagnetometerReading(const device::SensorReading& data)
+    : SensorReading(data) {}
+
+MagnetometerReading::~MagnetometerReading() = default;
+
+double MagnetometerReading::x() const {
+  return data().values[0];
+}
+
+double MagnetometerReading::y() const {
+  return data().values[1];
+}
+
+double MagnetometerReading::z() const {
+  return data().values[2];
+}
+
+bool MagnetometerReading::isReadingUpdated(
+    const device::SensorReading& previous) const {
+  return previous.values[0] != x() && previous.values[1] != y() &&
+         previous.values[2] != z();
+}
+
+DEFINE_TRACE(MagnetometerReading) {
+  SensorReading::trace(visitor);
+}
+
+}  // namespace blink