demo: add relative/absolute position mode demo

Samples~/Demo/Materials/UIParticle_Demo_Dot.mat

@@ -0,0 +1,84 @@
+%YAML 1.1
+%TAG !u! tag:unity3d.com,2011:
+--- !u!21 &2100000
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Samples~/Demo/Materials/UIParticle_Demo_Dot.mat.meta

@@ -0,0 +1,8 @@
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Samples~/Demo/Scripts/UIElementDragger.cs

@@ -14,6 +14,7 @@ public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler,
     private Canvas canvas;
     public Target m_Target;
     public Transform m_CustomTarget;
+    public bool ex2;
 
     private void OnEnable()
     {
@@ -37,6 +38,8 @@ public class UIElementDragger : MonoBehaviour, IBeginDragHandler, IDragHandler,
                 rectTransform.localPosition += delta;
                 if (m_CustomTarget)
                 {
+                    if (ex2)
+                        delta.Scale(canvas.rootCanvas.transform.localScale);
                     m_CustomTarget.localPosition += delta;
                 }
                 break;