Add |notify_client_on_reading_change| flag to sensor configuration

device/generic_sensor/sensor_impl.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_SENSOR_IMPL_H_
 #define DEVICE_GENERIC_SENSOR_SENSOR_IMPL_H_
 
 #include "base/macros.h"
 #include "device/generic_sensor/platform_sensor.h"
 #include "device/generic_sensor/public/interfaces/sensor.mojom.h"
@@ skipping 22 matching lines @@
 
   // device::Sensor::Client implementation.
   void OnSensorReadingChanged() override;
   void OnSensorError() override;
   bool IsNotificationSuspended() override;
 
  private:
   scoped_refptr<PlatformSensor> sensor_;
   mojom::SensorClientPtr client_;
   bool suspended_;
+  // The number of configurations that have |suppress_on_change_events_|
+  // flag set to true. If there is at least one configuration that sets this
+  // flag to true, SensorClient::SensorReadingChanged() is not called.
+  int suppress_on_change_events_count_;
 
   DISALLOW_COPY_AND_ASSIGN(SensorImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_SENSOR_IMPL_H_