Bug 1884440 - Stringify json payload and rename telemetry event field. r=sgalich

Differential Revision: https://phabricator.services.mozilla.com/D204093

toolkit/components/formautofill/Helpers.ios.mjs

@@ -171,11 +171,13 @@ export const Services = withNotImplementedError({
       }
 
       // eslint-disable-next-line no-undef
-      webkit.messageHandlers.addressFormTelemetryMessageHandler.postMessage({
-        type: "scalar",
-        name: scalarName,
-        value: scalarValue,
-      });
+      webkit.messageHandlers.addressFormTelemetryMessageHandler.postMessage(
+        JSON.stringify({
+          type: "scalar",
+          object: scalarName,
+          value: scalarValue,
+        })
+      );
     },
     recordEvent: (category, method, object, value, extra) => {
       // For now, we only care about the address form telemetry
@@ -194,14 +196,16 @@ export const Services = withNotImplementedError({
       }
 
       // eslint-disable-next-line no-undef
-      webkit.messageHandlers.addressFormTelemetryMessageHandler.postMessage({
-        type: "event",
-        category,
-        method,
-        object,
-        value,
-        extra,
-      });
+      webkit.messageHandlers.addressFormTelemetryMessageHandler.postMessage(
+        JSON.stringify({
+          type: "event",
+          category,
+          method,
+          object,
+          value,
+          extra,
+        })
+      );
     },
   }),
   // TODO(FXCM-936): we should use crypto.randomUUID() instead of Services.uuid.generateUUID() in our codebase