Add |notify_client_on_reading_change| flag to sensor configuration

device/generic_sensor/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 {
@@ skipping 22 matching lines @@
   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.
+
+  // For sensors with ON_CHANGE reporting mode:
+  // If true, SensorClient::SensorReadingChanged() signal is sent to the
+  // client; otherwise it is not.
+  // For sensors with CONTINUOUS reporting mode:
+  // This flag has no effect since SensorClient::SensorReadingChanged() is not
+  // sent to the client.
+  bool notify_client_on_reading_change = true;
 };
 
 // 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.
@@ skipping 29 matching lines @@
 // 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();
 };