[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/public/interfaces/sensor_struct_traits.h

+// 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.
+
+#ifndef DEVICE_GENERIC_SENSOR_PUBLIC_INTERFACES_SENSOR_STRUCT_TRAITS_H_
+#define DEVICE_GENERIC_SENSOR_PUBLIC_INTERFACES_SENSOR_STRUCT_TRAITS_H_
+
+#include "device/generic_sensor/platform_sensor_configuration.h"
+#include "device/generic_sensor/public/interfaces/sensor.mojom.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<device::mojom::SensorConfiguration,
+                    device::PlatformSensorConfiguration> {
+  static double frequency(const device::PlatformSensorConfiguration& input) {
+    return input.frequency();
+  }
+
+  static bool Read(device::mojom::SensorConfigurationDataView data,
+                   device::PlatformSensorConfiguration* out);
+};
+
+}  // namespace mojo
+
+#endif  // DEVICE_GENERIC_SENSOR_PUBLIC_INTERFACES_SENSOR_STRUCT_TRAITS_H_