Add project files.

Assets/Cryville/Common/Unity/UI/DockAspectRatioLayoutGroup.cs

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+using UnityEngine;
+
+namespace Cryville.Common.Unity.UI {
+	public sealed class DockAspectRatioLayoutGroup : DockLayoutGroup {
+		[SerializeField]
+		private float m_dockAspectRatio = 1;
+		public float DockAspectRatio {
+			get { return m_dockAspectRatio; }
+			set { base.SetProperty(ref m_dockAspectRatio, value); }
+		}
+
+		protected override float GetDockElementSize(Vector2 groupSize) {
+			return groupSize.y * m_dockAspectRatio;
+		}
+	}
+}