[sensors] Make generic_sensor a component

device/generic_sensor/public/cpp/platform_sensor_configuration.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_PLATFORM_SENSOR_CONFIGURATION_H_
 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_CONFIGURATION_H_
 
 #include "base/logging.h"
+#include "device/generic_sensor/generic_sensor_export.h"
 
 namespace device {
 
-class PlatformSensorConfiguration {
+class DEVICE_GENERIC_SENSOR_EXPORT PlatformSensorConfiguration {
  public:
   PlatformSensorConfiguration();
   explicit PlatformSensorConfiguration(double frequency);
   ~PlatformSensorConfiguration();
 
   bool operator==(const PlatformSensorConfiguration& other) const;
 
   // Platform dependent implementations can override this operator if different
   // optimal configuration comparison is required. By default, only frequency is
   // used to compare two configurations.
   virtual bool operator>(const PlatformSensorConfiguration& other) const;
 
   void set_frequency(double frequency);
   double frequency() const { return frequency_; }
 
  private:
   double frequency_ = 1.0;  // 1 Hz by default.
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SENSORS_PLATFORM_SENSOR_CONFIGURATION_H_