Qt: Implement GC TAS input window

Source/Core/DolphinQt2/QtUtils/AspectRatioWidget.h

@@ -0,0 +1,21 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <QWidget>
+
+class QBoxLayout;
+
+class AspectRatioWidget : public QWidget
+{
+public:
+  AspectRatioWidget(QWidget* widget, float width, float height, QWidget* parent = 0);
+  void resizeEvent(QResizeEvent* event);
+
+private:
+  QBoxLayout* m_layout;
+  float m_ar_width;
+  float m_ar_height;
+};