Add helpers for creating UI components.

mojo/ui/input_handler.cc

Index: mojo/ui/input_handler.cc
diff --git a/mojo/ui/input_handler.cc b/mojo/ui/input_handler.cc
new file mode 100644
index 0000000000000000000000000000000000000000..7eb06f8787e97d14db16a001b016f49c273e23f0
--- /dev/null
+++ b/mojo/ui/input_handler.cc
@@ -0,0 +1,29 @@
+// Copyright 2015 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 "mojo/ui/input_handler.h"
+
+#include "base/logging.h"
+#include "mojo/public/cpp/application/connect.h"
+
+namespace mojo {
+namespace ui {
+
+InputHandler::InputHandler(mojo::ServiceProvider* service_provider,
+                           mojo::ui::InputListener* listener)
+    : listener_binding_(listener) {
+  DCHECK(service_provider);
+  DCHECK(listener);
+
+  mojo::ConnectToService(service_provider, &connection_);
+
+  mojo::ui::InputListenerPtr listener_ptr;
+  listener_binding_.Bind(mojo::GetProxy(&listener_ptr));
+  connection_->SetListener(listener_ptr.Pass());
+}
+
+InputHandler::~InputHandler() {}
+
+}  // namespace ui
+}  // namespace mojo