Bug 1901261 - Create a remotely configurable bookmarks bar button messaging surface r=mviar,desktop-theme-reviewers,omc-reviewers

Differential Revision: https://phabricator.services.mozilla.com/D215252

browser/components/asrouter/modules/PanelTestProvider.sys.mjs

@@ -94,6 +94,28 @@ const MESSAGES = () => [
       patterns: ["*://*/*.pdf"],
     },
   },
+  {
+    id: "TEST_BMB_BUTTON",
+    groups: [],
+    template: "bookmarks_bar_button",
+    content: {
+      label: {
+        raw: "Getting Started",
+        tooltiptext: "Getting started with Firefox",
+      },
+      action: {
+        type: "OPEN_URL",
+        data: {
+          args: "https://www.mozilla.org",
+          where: "tab",
+        },
+        navigate: true,
+      },
+    },
+    frequency: { lifetime: 100 },
+    trigger: { id: "defaultBrowserCheck" },
+    targeting: "true",
+  },
   {
     id: "MULTISTAGE_SPOTLIGHT_MESSAGE",
     groups: ["panel-test-provider"],