[sensors] Introduce Generic Sensor API interfaces

device/sensors/sensor_type_converters.cc

+// 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 "device/sensors/sensor_type_converters.h"
+
+#include "device/sensors/platform_sensor.h"
+#include "device/sensors/platform_sensor_configuration.h"
+
+#define CHECK_ENUM(VALUE1, VALUE2)                                            \
+  static_assert(static_cast<int32_t>(VALUE1) == static_cast<int32_t>(VALUE2), \
+                "Enum value mismatch.")
+
+namespace mojo {
+
+// static
+device::PlatformSensorConfiguration
+TypeConverter<device::PlatformSensorConfiguration,
+              device::mojom::SensorConfigurationPtr>::
+    Convert(const device::mojom::SensorConfigurationPtr& sensor_configuration) {
+  return device::PlatformSensorConfiguration(sensor_configuration->frequency);

[dcheng, 2016/07/01 09:17:24]

Instead of adding new type converters, please use type mapping:
https://www.chromium.org/developers/design-documents/mojo/type-mapping

Something similar also works for enums, which use EnumTraits instead.

[shalamov, 2016/07/01 14:22:47]

Done.

+}
+
+// static
+device::SensorType
+TypeConverter<device::SensorType, device::mojom::SensorType>::Convert(
+    device::mojom::SensorType sensor_type) {
+  CHECK_ENUM(device::SensorType::FIRST, device::mojom::SensorType::FIRST);
+  CHECK_ENUM(device::SensorType::AMBIENT_LIGHT,
+             device::mojom::SensorType::AMBIENT_LIGHT);
+  CHECK_ENUM(device::SensorType::PROXIMITY,
+             device::mojom::SensorType::PROXIMITY);
+  CHECK_ENUM(device::SensorType::LINEAR_ACCELERATION,
+             device::mojom::SensorType::LINEAR_ACCELERATION);
+  CHECK_ENUM(device::SensorType::GYROSCOPE,
+             device::mojom::SensorType::GYROSCOPE);
+  CHECK_ENUM(device::SensorType::PRESSURE, device::mojom::SensorType::PRESSURE);
+  CHECK_ENUM(device::SensorType::LAST, device::mojom::SensorType::LAST);
+
+  return static_cast<device::SensorType>(sensor_type);
+}
+
+// static
+device::mojom::ReportingMode
+TypeConverter<device::mojom::ReportingMode, device::ReportingMode>::Convert(
+    device::ReportingMode reporting_mode) {
+  CHECK_ENUM(device::ReportingMode::ON_CHANGE,
+             device::mojom::ReportingMode::ON_CHANGE);
+  CHECK_ENUM(device::ReportingMode::CONTINUOUS,
+             device::mojom::ReportingMode::CONTINUOUS);
+  return static_cast<device::mojom::ReportingMode>(reporting_mode);
+}
+
+}  // namespace mojo