Created paring flow interface for controller side.

ui/chromeos/pairing/controller_pairing_flow.cc

Index: ui/chromeos/pairing/controller_pairing_flow.cc
diff --git a/ui/chromeos/pairing/controller_pairing_flow.cc b/ui/chromeos/pairing/controller_pairing_flow.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1b89f5b316394034fcb23089445b7f9be15f2b54
--- /dev/null
+++ b/ui/chromeos/pairing/controller_pairing_flow.cc
@@ -0,0 +1,17 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/chromeos/pairing/controller_pairing_flow.h"
+
+namespace ui {
+
+ControllerPairingFlow::Observer::Observer() {}
+
+ControllerPairingFlow::Observer::~Observer() {}
+
+ControllerPairingFlow::ControllerPairingFlow() {}
+
+ControllerPairingFlow::~ControllerPairingFlow() {}
+
+}  // namespace ui