Update URL generation in gr-related-changes-list

Change-Id: Idb9d2464e473ca167e6794ca5e0a7cbc52d8e933

polygerrit-ui/app/elements/core/gr-navigation/gr-navigation.html

@@ -188,6 +188,21 @@ limitations under the License.
         });
       },
 
+      /**
+       * @param {number} changeNum
+       * @param {string} project The name of the project.
+       * @param {number=} opt_patchNum
+       * @return {string}
+       */
+      getUrlForChangeById(changeNum, project, opt_patchNum) {
+        return this._getUrlFor({
+          view: Gerrit.Nav.View.CHANGE,
+          changeNum,
+          project,
+          patchNum: opt_patchNum,
+        });
+      },
+
       /**
        * @param {!Object} change The change object.
        * @param {number=} opt_patchNum