Add API to completely disable Runtime Debug UI (#5339) (#5982)

* Add DebugManager.enableRuntimeUI that disables DebugUpdater entirely.

The code structure has changed quite a bit so this backport only includes the essential part required to fix case 1345783.

Author: arttu-peltonen

com.unity.render-pipelines.core/CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [10.8.0] - 2021-09-20
 
 Version Updated
-The version number for this package has increased due to a version update of a related graphics package.
+The version number for this package has increased due to a version update of a related graphics package.

### Fixed
- Fixed potentially conflicting runtime Rendering Debugger UI command by adding an option to disable runtime UI altogether (1345783).
 
 ## [10.7.0] - 2021-07-02
 

com.unity.render-pipelines.core/Runtime/Debugging/DebugManager.cs

@@ -88,6 +88,24 @@ public ReadOnlyCollection<DebugUI.Panel> panels
         /// <param name="open">State of the debug window.</param>
         public void ToggleEditorUI(bool open) => m_EditorOpen = open;
 
+        private bool m_EnableRuntimeUI = true;
+
+        /// <summary>
+        /// Controls whether runtime UI can be enabled. When this is set to false, there will be no overhead
+        /// from debug GameObjects or runtime initialization.
+        /// </summary>
+        public bool enableRuntimeUI
+        {
+            get => m_EnableRuntimeUI;
+            set
+            {
+                if (value != m_EnableRuntimeUI)
+                {
+                    m_EnableRuntimeUI = value;
+                }
+            }
+        }
+
         /// <summary>
         /// Displays the runtime version of the debug window.
         /// </summary>

com.unity.render-pipelines.core/Runtime/Debugging/DebugUpdater.cs

@@ -5,7 +5,7 @@ class DebugUpdater : MonoBehaviour
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         static void RuntimeInit()
         {
-            if (!Debug.isDebugBuild || FindObjectOfType<DebugUpdater>() != null)
+            if (!Debug.isDebugBuild || !DebugManager.instance.enableRuntimeUI || FindObjectOfType<DebugUpdater>() != null)
                 return;
 
             var go = new GameObject { name = "[Debug Updater]" };

com.unity.render-pipelines.high-definition/Documentation~/Render-Pipeline-Debug-Window.md

@@ -21,6 +21,8 @@ To open the Render Pipeline Debug window in the Editor, go to  **Window > Render
 
 You can display read-only items such as the FPS counter independently of the **Render Pipeline Debug** window. This means that when you disable the **Render Pipeline Debug** window, they are still visible in the top right corner of the screen. This is particularly useful if you want to track particular values without cluttering the screen.
 
+You can disable the runtime UI entirely by using the [enableRuntimeUI](https://docs.unity3d.com/Packages/[email protected]/api/UnityEngine.Rendering.DebugManager.html#UnityEngine_Rendering_DebugManager_enableRuntimeUI) property.
+
 ### Navigation at runtime
 
 To change the current active item: