Revert of Move //device/generic_sensor to be part of the internal implementation of the Device Service.

services/device/public/interfaces/sensor.mojom

-// 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.
-
-module device.mojom;
-
-// Types of supported sensors
-// When adding new sensor type, update the documentation of sensor data values
-// in SensorReading struct at sensor_reading.h file.
-enum SensorType {
-  FIRST = 1,
-  AMBIENT_LIGHT = FIRST,
-  PROXIMITY,
-  ACCELEROMETER,
-  LINEAR_ACCELERATION,
-  GYROSCOPE,
-  MAGNETOMETER,
-  PRESSURE,
-  ABSOLUTE_ORIENTATION,
-  RELATIVE_ORIENTATION,
-  LAST = RELATIVE_ORIENTATION // Note: LAST is also equal to the types count.
-};
-
-// Reporting mode supported by the Sensor.
-// ON_CHANGE  - client will be notified through OnSensorReadingChanged() signal
-//              whenever sensor reading is changed.
-// CONTINUOUS - sensor will continuously update its reading with frequency
-//              specified in SensorConfiguration.frequency.
-//              OnSensorReadingChanged() signal is not sent to the client for
-//              sensors with CONTINUOUS reporting mode.
-enum ReportingMode {
-  ON_CHANGE,
-  CONTINUOUS
-};
-
-struct SensorConfiguration {
-  // Maximum allowed frequency is 60 Hz.
-  const double kMaxAllowedFrequency = 60.0;
-
-  // Requested frequency in Hz.
-  double frequency;
-  // TODO(shalamov): Add map<string, union> for sensor specific configuration.
-};
-
-// Interface for controlling the Sensor.
-interface Sensor {
-
-  // Requests sensor to provide its default configuration.
-  GetDefaultConfiguration() => (SensorConfiguration configuration);
-
-  // Requests sensor to start reading sensor data with specified
-  // SensorConfiguration.
-  // Sensor holds the list of added configurations and it always polls
-  // the platform (and updates the shared buffer) at the maxiumum frequency
-  // among the obtained from the stored configurations, so that all clients
-  // can have sensor data in time.
-  // Returns 'true' if |configuration| was successfully added.
-  // Returns 'false' if |configuration| could not be added (is invalid
-  // or not supported).
-  AddConfiguration(SensorConfiguration configuration) => (bool success);
-
-  // Requests sensor to stop reading sensor data for specified
-  // SensorConfiguration.
-  // This call excludes |configuration| from the Sensor's list making it
-  // reconsider the the shared buffer udpate frequency. If there are no
-  // configurations left in the Sensor's configuration list it stops polling
-  // sensor data from the platform and update the shared buffer.
-  // Returns 'true' if |configuration| was successfully removed;
-  // returns 'false' if |configuration| could not be removed due to an error
-  // (e.g. |configuration| is not present in the Sensor's list).
-  RemoveConfiguration(SensorConfiguration configuration) => (bool success);
-
-  // Temporary suppresses sensor reading changes notification and deactivates
-  // all the previously added configurations for current instance.
-  Suspend();
-
-  // Resumes previously suspended sensor reading changes notification and
-  // activates all the previously added configurations for current instance.
-  Resume();
-};
-
-// Interface that client of the Sensor interface must implement to observe
-// sensor reading changes and error conditions.
-interface SensorClient {
-  // Signals SensorClient when there is an error.
-  RaiseError();
-
-  // Signals SensorClient when reading has been changed (only for sensors with
-  // ReportingMode::ON_CHANGE).
-  SensorReadingChanged();
-};