Bug 1640026 - Telemetry requirement for multistage about:welcome r=Mardak

Differential Revision: https://phabricator.services.mozilla.com/D76933

browser/components/newtab/content-src/lib/aboutwelcome-utils.js

@@ -12,6 +12,34 @@ export const AboutWelcomeUtils = {
       message_id: messageId,
     });
   },
+  sendActionTelemetry(messageId, elementId) {
+    const ping = {
+      event: "CLICK_BUTTON",
+      event_context: {
+        source: elementId,
+        page: "about:welcome",
+      },
+      message_id: messageId,
+    };
+    window.AWSendEventTelemetry(ping);
+  },
+  async fetchFlowParams(metricsFlowUri) {
+    let flowParams;
+    try {
+      const response = await fetch(metricsFlowUri, {
+        credentials: "omit",
+      });
+      if (response.status === 200) {
+        const { deviceId, flowId, flowBeginTime } = await response.json();
+        flowParams = { deviceId, flowId, flowBeginTime };
+      } else {
+        console.error("Non-200 response", response); // eslint-disable-line no-console
+      }
+    } catch (e) {
+      flowParams = null;
+    }
+    return flowParams;
+  },
   sendEvent(type, detail) {
     document.dispatchEvent(
       new CustomEvent(`AWPage:${type}`, {