Add sensors application to mojo

sky/services/sensors/sensors.mojom

-// Copyright 2015 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.
-
-module sensors;
-
-enum SensorType {
-  ACCELEROMETER,
-  AMBIENT_TEMPERATURE,
-  GAME_ROTATION_VECTOR,
-  GEOMAGNETIC_ROTATION_VECTOR,
-  GRAVITY,
-  GYROSCOPE,
-  GYROSCOPE_UNCALIBRATED,
-  HEART_RATE,
-  LIGHT,
-  LINEAR_ACCELERATION,
-  MAGNETIC_FIELD,
-  MAGNETIC_FIELD_UNCALIBRATED,
-  PRESSURE,
-  PROXIMITY,
-  RELATIVE_HUMIDITY,
-  ROTATION_VECTOR,
-  SIGNIFICANT_MOTION,
-  STEP_COUNTER,
-  STEP_DETECTOR,
-};
-
-struct SensorData {
-  int32 accuracy;
-  int64 time_stamp;
-  array<float> values;
-};
-
-interface SensorListener {
-  OnAccuracyChanged(int32 accuracy);
-  OnSensorChanged(SensorData data);
-};
-
-interface SensorService {
-  AddListener(SensorType type, SensorListener listener);
-};