UI 자동화를 위해 바인딩 기능 구현

- 유니티 에셋 인증 오류로 meta 재생성

Packages/com.unity.inputsystem/InputSystem/Editor/PropertyDrawers/InputActionAssetDrawer.cs

@@ -0,0 +1,28 @@
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEditor.Search;
+
+namespace UnityEngine.InputSystem.Editor
+{
+    /// <summary>
+    /// Custom property drawer in order to use the "Advanced Picker" from UnityEditor.Search.
+    /// </summary>
+    [CustomPropertyDrawer(typeof(InputActionAsset))]
+    internal sealed class InputActionAssetDrawer : PropertyDrawer
+    {
+        private readonly SearchContext m_Context = UnityEditor.Search.SearchService.CreateContext(new[]
+        {
+            InputActionAssetSearchProviders.CreateInputActionAssetSearchProvider(),
+            InputActionAssetSearchProviders.CreateInputActionAssetSearchProviderForProjectWideActions(),
+        }, string.Empty, SearchConstants.PickerSearchFlags);
+
+
+        public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
+        {
+            ObjectField.DoObjectField(position, property, typeof(InputActionAsset), label,
+                m_Context, SearchConstants.PickerViewFlags);
+        }
+    }
+}
+
+#endif