Reland "components/arc: implement multi advertising"

device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h

Index: device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
diff --git a/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h b/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
index bd7826f42d263846c40053f98a994e369ade7f8f..ee5431160f54964ba8fe31b70cf994611f2ffc4a 100644
--- a/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
+++ b/device/bluetooth/dbus/fake_bluetooth_le_advertising_manager_client.h
@@ -61,6 +61,10 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothLEAdvertisingManagerClient
   FakeBluetoothLEAdvertisementServiceProvider* GetAdvertisementServiceProvider(
       const std::string& uuid);
 
+  int currently_registered() { return currently_registered_.size(); }
+
+  enum : size_t { kMaxBluezAdvertisements = 5 };
+
  private:
   // Map of a D-Bus object path to the FakeBluetoothAdvertisementServiceProvider
   // registered for it; maintained by RegisterAdvertisementServiceProvider() and
@@ -71,9 +75,8 @@ class DEVICE_BLUETOOTH_EXPORT FakeBluetoothLEAdvertisingManagerClient
       ServiceProviderMap;
   ServiceProviderMap service_provider_map_;
 
-  // Holds the currently registered advertisement. If there is no advertisement
-  // registered, this path is empty.
-  dbus::ObjectPath currently_registered_;
+  // Holds currently registered advertisements.
+  std::vector<dbus::ObjectPath> currently_registered_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeBluetoothLEAdvertisingManagerClient);
 };