[sensors](CrOS/Linux) Implement Sensor device manager for sensors

device/generic_sensor/linux/sensor_data_linux.h

Index: device/generic_sensor/linux/sensor_data_linux.h
diff --git a/device/generic_sensor/linux/sensor_data_linux.h b/device/generic_sensor/linux/sensor_data_linux.h
index 3336a8e3d414911ac5b1acee468ac21b21c61989..18483620369995f7a547cae60e6050bf74455f92 100644
--- a/device/generic_sensor/linux/sensor_data_linux.h
+++ b/device/generic_sensor/linux/sensor_data_linux.h
@@ -10,6 +10,7 @@
 
 namespace device {
 
+class PlatformSensorConfiguration;
 struct SensorReading;
 
 // This structure represents a context that is used to
@@ -17,8 +18,8 @@ struct SensorReading;
 // sensor that uses the SensorReader to read sensor
 // data from files specified in the |sensor_file_names|.
 struct DEVICE_GENERIC_SENSOR_EXPORT SensorDataLinux {
-  using ReaderFunctor =
-      base::Callback<void(double scaling, SensorReading& reading)>;
+  using ReaderFunctor = base::Callback<
+      void(double scaling, double offset, SensorReading& reading)>;
 
   SensorDataLinux();
   ~SensorDataLinux();
@@ -31,16 +32,21 @@ struct DEVICE_GENERIC_SENSOR_EXPORT SensorDataLinux {
   std::vector<std::vector<std::string>> sensor_file_names;
   // Scaling file to be found.
   std::string sensor_scale_name;
+  // Frequency file to be found.
+  std::string sensor_frequency_file_name;
+  // Offset file to be found.
+  std::string sensor_offset_file_name;
   // Used to apply scalings to raw sensor data.
   ReaderFunctor apply_scaling_func;
-  // Reporting mode of a sensor.
-  mojom::ReportingMode reporting_mode;
+  // Sensor type
+  mojom::SensorType type;
   // Default configuration of a sensor.
   PlatformSensorConfiguration default_configuration;
 };
 
 // Initializes a sensor type specific data.
-bool InitSensorData(mojom::SensorType type, SensorDataLinux* data);
+bool DEVICE_GENERIC_SENSOR_EXPORT InitSensorData(mojom::SensorType type,
+                                                 SensorDataLinux* data);
 
 }  // namespace device