[sensors] Add Generic Sensor platform unit tests.

device/generic_sensor/platform_sensor.h

Index: device/generic_sensor/platform_sensor.h
diff --git a/device/generic_sensor/platform_sensor.h b/device/generic_sensor/platform_sensor.h
index 2019d343af4eb9410b82e75a36c84029f356725c..a12bb394ddbca51a239b3fd41d90d3cc30ee6728 100644
--- a/device/generic_sensor/platform_sensor.h
+++ b/device/generic_sensor/platform_sensor.h
@@ -57,7 +57,10 @@ class PlatformSensor : public base::RefCountedThreadSafe<PlatformSensor> {
 
   using ConfigMap = std::map<Client*, std::list<PlatformSensorConfiguration>>;
 
-  virtual bool UpdateSensorInternal(const ConfigMap& configurations) = 0;
+  virtual bool UpdateSensorInternal(const ConfigMap& configurations);
+  virtual bool StartSensor(
+      const PlatformSensorConfiguration& configuration) = 0;
+  virtual void StopSensor() = 0;
   virtual bool CheckSensorConfiguration(
       const PlatformSensorConfiguration& configuration) = 0;
 
@@ -68,6 +71,7 @@ class PlatformSensor : public base::RefCountedThreadSafe<PlatformSensor> {
 
  private:
   friend class base::RefCountedThreadSafe<PlatformSensor>;
+  friend class MockPlatformSensor;

[shalamov, 2016/09/07 09:53:01]

Is this needed?

[maksims (do not use this acc), 2016/09/09 10:39:06]

Otherwise I cannot get config_map_. It's private.

 
   mojom::SensorType type_;
   base::ObserverList<Client, true> clients_;