[Bluetooth] Improve the adapter's awareness of connected devices.

device/bluetooth/bluetooth_adapter_mac.h

Index: device/bluetooth/bluetooth_adapter_mac.h
diff --git a/device/bluetooth/bluetooth_adapter_mac.h b/device/bluetooth/bluetooth_adapter_mac.h
index 02a6e8a7f04b84b4d32de025f79a1baa8c986aec..7040932db28f06826a64706b14fd7c6cf81a9849 100644
--- a/device/bluetooth/bluetooth_adapter_mac.h
+++ b/device/bluetooth/bluetooth_adapter_mac.h
@@ -75,6 +75,9 @@ class BluetoothAdapterMac : public BluetoothAdapter,
   virtual void DiscoveryStopped(BluetoothDiscoveryManagerMac* manager,
                                 bool unexpected) OVERRIDE;
 
+  // Registers that a new |device| has connected to the local host.
+  void DeviceConnected(IOBluetoothDevice* device);
+
  protected:
   // BluetoothAdapter:
   virtual void RemovePairingDelegateInternal(
@@ -98,8 +101,10 @@ class BluetoothAdapterMac : public BluetoothAdapter,
   void InitForTest(scoped_refptr<base::SequencedTaskRunner> ui_task_runner);
   void PollAdapter();
 
-  // Updates |devices_| to be consistent with |devices|.
-  void UpdateDevices(NSArray* devices);
+  // Updates |devices_| to include the currently paired devices, as well as any
+  // connected, but unpaired, devices. Notifies observers if any previously
+  // paired or connected devices are no longer present.
+  void UpdateDevices();
 
   std::string address_;
   std::string name_;