WebXR manual room capture (#5774)

* provide webxr manual room capture method

* XrRoomCapture > XrRoomCaptureCallback

src/framework/xr/xr-manager.js

@@ -25,6 +25,13 @@ import { XrAnchors } from './xr-anchors.js';
  * @param {Error|null} err - The Error object or null if operation was successful.
  */
 
+/**
+ * Callback used by manual room capturing.
+ *
+ * @callback XrRoomCaptureCallback
+ * @param {Error|null} err - The Error object or null if manual room capture was successful.
+ */
+
 /**
  * Manage and update XR session and its states.
  *
@@ -551,6 +558,40 @@ class XrManager extends EventHandler {
         }
     }
 
+    /**
+     * Initiate manual room capture. If the underlying XR system supports manual capture of the
+     * room, it will start the capturing process, which can affect plane and mesh detection,
+     * and improve hit-test quality against real-world geometry.
+     *
+     * @param {XrRoomCaptureCallback} callback - Callback that will be fired once capture is complete
+     * or failed.
+     *
+     * @example
+     * this.app.xr.initiateRoomCapture((err) => {
+     *     if (err) {
+     *         // capture failed
+     *         return;
+     *     }
+     *     // capture was successful
+     * });
+     */
+    initiateRoomCapture(callback) {
+        if (!this._session) {
+            callback(new Error('Session is not active'));
+            return;
+        }
+        if (!this._session.initiateRoomCapture) {
+            callback(new Error('Session does not support manual room capture'));
+            return;
+        }
+
+        this._session.initiateRoomCapture().then(() => {
+            if (callback) callback(null);
+        }).catch((err) => {
+            if (callback) callback(err);
+        });
+    }
+
     /**
      * @param {string} type - Session type.
      * @private