Bug 1457007 - Fix missing schema information for contentUsesTiling. r=me on a CLOSED TREE

toolkit/modules/tests/browser/browser_Troubleshoot.js

@@ -348,6 +348,9 @@ const SNAPSHOT_SCHEMA = {
         usesTiling: {
           type: "boolean",
         },
+        contentUsesTiling: {
+          type: "boolean",
+        },
         offMainThreadPaintEnabled: {
           type: "boolean",
         },