Handle change of BLE address after pairing

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 bfbf0dce8f89133f2d0f32ac4391ad48a97a4573..cf4c97f4866ce7f41c1b1c1370691d6ff1f3f3d1 100644
--- a/device/bluetooth/bluetooth_device.h
+++ b/device/bluetooth/bluetooth_device.h
@@ -418,10 +418,10 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   // returned BluetoothGattConnection will be automatically marked as inactive.
   // To monitor the state of the connection, observe the
   // BluetoothAdapter::Observer::DeviceChanged method.
-  typedef base::Callback<void(scoped_ptr<BluetoothGattConnection>)>
-      GattConnectionCallback;
-  virtual void CreateGattConnection(const GattConnectionCallback& callback,
-                                    const ConnectErrorCallback& error_callback);
+  typedef base::Callback<void()> GattConnectionCallback;
+  virtual scoped_ptr<device::BluetoothGattConnection> CreateGattConnection(
+      const GattConnectionCallback& callback,
+      const ConnectErrorCallback& error_callback);
 
   // Returns the list of discovered GATT services.
   virtual std::vector<BluetoothGattService*> GetGattServices() const;
@@ -463,7 +463,12 @@ class DEVICE_BLUETOOTH_EXPORT BluetoothDevice {
   // Subclasses must also call DidConnectGatt, DidFailToConnectGatt, or
   // DidDisconnectGatt immediately or asynchronously as the connection state
   // changes.
-  virtual void CreateGattConnectionImpl() = 0;
+  virtual scoped_ptr<device::BluetoothGattConnection>
+  CreateGattConnectionImpl() = 0;
+
+  // Return new BluetoothGattConnection for already connected BluetoothDevice.
+  virtual scoped_ptr<device::BluetoothGattConnection>
+  ExistingGattConnection() = 0;
 
   // Disconnects GATT connection on platforms that maintain a specific GATT
   // connection.