Renaming and small fixes for Debug Window framework.

ScriptableRenderPipeline/Core/Debugging/DebugItemHandler.cs

             m_DebugItem = item;
         }
 
-        // Method user needs to override for specific value clamping.
-        public virtual void ClampValues(Func<object> getter, Action<object> setter) {}
+        // Method user needs to override for specific value validation.
+        public virtual void ValidateValues(Func<object> getter, Action<object> setter) {}
         // Method that will create UI items for runtime debug menu.
         public abstract DebugItemUI BuildGUI(GameObject parent);
 
             m_Max = max;
         }
 
-        public override void ClampValues(Func<object> getter, Action<object> setter)
+        public override void ValidateValues(Func<object> getter, Action<object> setter)
         {
             setter(Mathf.Clamp((float)getter(), m_Min, m_Max));
         }
             m_Max = max;
         }
 
-        public override void ClampValues(Func<object> getter, Action<object> setter)
+        public override void ValidateValues(Func<object> getter, Action<object> setter)
         {
             setter(Math.Min(m_Max, Math.Max(m_Min, (uint)getter())));
         }

ScriptableRenderPipeline/Core/Debugging/DebugItemUI.cs

 
         public bool dynamicDisplay { get { return (m_DebugItem.flags & DebugItemFlag.DynamicDisplay) != 0; } }
 
+        public DebugItem debugItem { get { return m_DebugItem; } }
+
         protected DebugItemUI(DebugItem debugItem)
         {
             m_DebugItem = debugItem;

ScriptableRenderPipeline/Core/Debugging/DebugMenuState.cs

 
 namespace UnityEngine.Experimental.Rendering
 {
-    [Serializable]
     public abstract class DebugItemState
         : ScriptableObject
     {
                     if (debugItemState == null)
                     {
                         debugItemState = item.handler.CreateDebugItemState();
-                        debugItemState.hideFlags = HideFlags.DontSave;
-                        debugItemState.Initialize(item);
-                        debugItemState.SetValue(item.GetValue());
-                        AddDebugItemState(debugItemState);
+                        if(debugItemState != null)
+                        {
+                            debugItemState.hideFlags = HideFlags.DontSave;
+                            debugItemState.Initialize(item);
+                            debugItemState.SetValue(item.GetValue());
+                            AddDebugItemState(debugItemState);
+                        }
+                        else
+                        {
+                            Debug.LogWarning(String.Format("DebugItemState for item {0} of type {1} is not provided.\nDid you implement CreateDebugItemState in your custom Handler?", item.name, item.type));
+                        }
                     }
                 }
             }

ScriptableRenderPipeline/Core/Debugging/DebugPanel.cs

             if(m_Setter != null)
             {
                 m_Setter(value);
-                m_Handler.ClampValues(m_Getter, m_Setter);
+                m_Handler.ValidateValues(m_Getter, m_Setter);
             }
 
             if (record && OnItemDirty != null)

ScriptableRenderPipeline/Core/Debugging/DebugPanelUI.cs

                 GameObject.Destroy(child.gameObject);
             }
 
+            m_ItemsUI.Clear();
+
+        protected void AddDebugItemUI(DebugItem item, GameObject parent)
+        {
+#if UNITY_EDITOR
+            // We don't want runtime only items even in the "player" debug menu if we are in the editor.
+            if (item.runtimeOnly)
+                return;
+#endif
+            if(item.editorOnly)
+                return;
+
+            DebugItemUI itemUI = item.handler.BuildGUI(parent);
+            if(itemUI == null)
+            {
+                Debug.LogWarning(String.Format("DebugItemUI not provided for item {0} of type {1}.\n Did you implement BuildGUI for your custom Handler?", item.name, item.type));
+            }
+            else
+            {
+                m_ItemsUI.Add(itemUI);
+            }
+        }
+
-            m_ItemsUI.Clear();
-#if UNITY_EDITOR
-                // We don't want runtime only items even in the "player" debug menu if we are in the editor.
-                if (item.runtimeOnly)
-                    continue;
-#endif
-                if(!item.editorOnly)
-                {
-                    DebugItemHandler handler = item.handler; // Should never be null, we have at least the default handler
-                    m_ItemsUI.Add(handler.BuildGUI(parent));
-                }
+                AddDebugItemUI(item, parent);
             }
         }
 
         {
             if (m_SelectedItem != -1)
             {
-                return m_DebugPanel.GetDebugItem(m_SelectedItem);
+                return m_ItemsUI[m_SelectedItem].debugItem;
             }
 
             return null;
 
         public void OnMoveHorizontal(float value)
         {
-            if (m_SelectedItem != -1 && !m_DebugPanel.GetDebugItem(m_SelectedItem).readOnly)
+            if (m_SelectedItem != -1 && !m_ItemsUI[m_SelectedItem].debugItem.readOnly)
             {
                 if (value > 0.0f)
                     m_ItemsUI[m_SelectedItem].OnIncrement();
 
         public void OnValidate()
         {
-            if (m_SelectedItem != -1 && !m_DebugPanel.GetDebugItem(m_SelectedItem).readOnly)
+            if (m_SelectedItem != -1 && !m_ItemsUI[m_SelectedItem].debugItem.readOnly)
                 m_ItemsUI[m_SelectedItem].OnValidate();
         }
 

ScriptableRenderPipeline/HDRenderPipeline/Debug/LightingDebugPanel.cs

 
         }
 
-        public override void ClampValues(Func<object> getter, Action<object> setter)
+        public override void ValidateValues(Func<object> getter, Action<object> setter)
         {
             HDRenderPipeline hdPipeline = RenderPipelineManager.currentPipeline as HDRenderPipeline;
             m_Max = (uint)hdPipeline.GetShadowAtlasCount() - 1;
 
         }
 
-        public override void ClampValues(Func<object> getter, Action<object> setter)
+        public override void ValidateValues(Func<object> getter, Action<object> setter)
         {
             HDRenderPipeline hdPipeline = RenderPipelineManager.currentPipeline as HDRenderPipeline;
             m_Max = (uint)hdPipeline.GetCurrentShadowCount() - 1;