Add abstract BluetoothProfile class

device/bluetooth/bluetooth_device.h

Index: device/bluetooth/bluetooth_device.h
diff --git a/device/bluetooth/bluetooth_device.h b/device/bluetooth/bluetooth_device.h
index 26321bcdb538ad1ac693ad010a9041d47994bee0..30895a685f1fb00a2b515e91356668088e8f8e3c 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -14,6 +14,7 @@
 
 namespace device {
 
+class BluetoothProfile;
 class BluetoothServiceRecord;
 class BluetoothSocket;
 
@@ -302,6 +303,12 @@ class BluetoothDevice {
   virtual void ConnectToService(const std::string& service_uuid,
                                 const SocketCallback& callback) = 0;
 
+  // Attempts to initiate an outgoing connection to this device for the profile
+  // identified by |profile|, on success the profile's connection callback
+  // wil be called; on failure |error_callback| will be called.
+  virtual void ConnectToProfile(BluetoothProfile* profile,
+                                const ErrorCallback& error_callback) = 0;
+
   // Sets the Out Of Band pairing data for this device to |data|.  Exactly one
   // of |callback| or |error_callback| will be run.
   virtual void SetOutOfBandPairingData(