DolphinQt: Handle the Host_UpdateTitle callback.

Source/Core/DolphinQt/Host.h

@@ -0,0 +1,19 @@
+// Copyright 2015 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QEvent>
+#include <string>
+
+enum HostEvent {
+	TitleEvent = QEvent::User + 1,
+};
+
+class HostTitleEvent final : public QEvent
+{
+public:
+	HostTitleEvent(const std::string& title);
+	const std::string m_title;
+};