Add support for cellular geolocation

chromeos/network/geolocation_handler.h

Index: chromeos/network/geolocation_handler.h
diff --git a/chromeos/network/geolocation_handler.h b/chromeos/network/geolocation_handler.h
index f962328511ff802fd717a44abd5ad385493c08f8..12efe5bc30f535fe921664d3f0a300197404ce52 100644
--- a/chromeos/network/geolocation_handler.h
+++ b/chromeos/network/geolocation_handler.h
@@ -21,10 +21,11 @@ class DictionaryValue;
 
 namespace chromeos {
 
-// This class provices Shill Wifi Access Point data. It currently relies on
-// polling because that is the usage model in content::WifiDataProvider. This
-// class requests data asynchronously, returning the most recent available data.
-// A typical usage pattern, assuming a wifi device is enabled, is:
+// This class provices Shill Wifi Access Point and Cell Tower data. It
+// currently relies on polling because that is the usage model in
+// content::WifiDataProvider. This class requests data asynchronously,
+// returning the most recent available data. A typical usage pattern,
+// assuming a wifi device is enabled, is:
 //   Initialize();  // Makes an initial request
 //   GetWifiAccessPoints();  // returns true + inital data, requests update
 //   (Delay some amount of time, ~10s)
@@ -37,14 +38,23 @@ class CHROMEOS_EXPORT GeolocationHandler : public ShillPropertyChangedObserver {
  public:
   ~GeolocationHandler() override;
 
-  // This sends a request for wifi access point data. If data is already
-  // available, returns |true|, fills |access_points| with the latest access
-  // point data, and sets |age_ms| to the time since the last update in MS.
+  // This sends a request for geolocation (both wifi AP and cell tower) data.
+  // If wifi data is already available, returns |true|, fills |access_points|
+  // with the latest access point data, and sets |age_ms| to the time
+  // since the last update in MS.
   bool GetWifiAccessPoints(WifiAccessPointVector* access_points,
                            int64_t* age_ms);
 
   bool wifi_enabled() const { return wifi_enabled_; }
 
+  // This sends a request for geolocation (both wifi AP and cell tower) data.
+  // If cell data is already available, returns |true|, fills |cell_towers|
+  // with the latest cell tower data, and sets |age_ms| to the time
+  // since the last update in MS.
+  bool GetCellTowers(CellTowerVector* cell_towers, int64_t* age_ms);
+
+  bool cellular_enabled() const { return cellular_enabled_; }
+
   // ShillPropertyChangedObserver overrides
   void OnPropertyChanged(const std::string& key,
                          const base::Value& value) override;
@@ -52,7 +62,7 @@ class CHROMEOS_EXPORT GeolocationHandler : public ShillPropertyChangedObserver {
  private:
   friend class NetworkHandler;
   friend class GeolocationHandlerTest;
-  friend class SimpleGeolocationWiFiTest;
+  friend class SimpleGeolocationWirelessTest;
 
   GeolocationHandler();
 
@@ -65,19 +75,27 @@ class CHROMEOS_EXPORT GeolocationHandler : public ShillPropertyChangedObserver {
   // Called from OnPropertyChanged or ManagerPropertiesCallback.
   void HandlePropertyChanged(const std::string& key, const base::Value& value);
 
-  // Asynchronously request wifi access points from Shill.Manager.
-  void RequestWifiAccessPoints();
+  // Asynchronously request geolocation objects (wifi access points and
+  // cell towers) from Shill.Manager.
+  void RequestGeolocationObjects();
 
   // Callback for receiving Geolocation data.
   void GeolocationCallback(DBusMethodCallStatus call_status,
                            const base::DictionaryValue& properties);
 
-  // Wifi enabled state
+  bool cellular_enabled_;
   bool wifi_enabled_;
 
+  void AddCellTowerFromDict(const base::DictionaryValue* entry);
+  void AddAccessPointFromDict(const base::DictionaryValue* entry);
+
   // Cached wifi access points and update time
   WifiAccessPointVector wifi_access_points_;
-  base::Time geolocation_received_time_;
+  base::Time access_point_received_time_;
+
+  // Cached cell towers and update time
+  CellTowerVector cell_towers_;
+  base::Time cell_towers_received_time_;
 
   // For Shill client callbacks
   base::WeakPtrFactory<GeolocationHandler> weak_ptr_factory_;