[sensors] Add Generic Sensor platform unit tests.

device/generic_sensor/platform_sensor.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_H_
 #define DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_H_
 
 #include <list>
 #include <map>
 
@@ skipping 51 matching lines @@
       const PlatformSensorConfiguration& configuration) = 0;
   virtual void StopSensor() = 0;
   virtual bool CheckSensorConfiguration(
       const PlatformSensorConfiguration& configuration) = 0;
 
   void NotifySensorReadingChanged();
   void NotifySensorError();
 
   mojo::ScopedSharedBufferMapping shared_buffer_mapping_;
 
+  // For testing purposes.
+  const ConfigMap& config_map() const { return config_map_; }
+
  private:
   friend class base::RefCountedThreadSafe<PlatformSensor>;
 
   mojom::SensorType type_;
   base::ObserverList<Client, true> clients_;
   ConfigMap config_map_;
   PlatformSensorProvider* provider_;
   base::WeakPtrFactory<PlatformSensor> weak_factory_;
   DISALLOW_COPY_AND_ASSIGN(PlatformSensor);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_GENERIC_SENSOR_PLATFORM_SENSOR_H_