1 files changed, 27 insertions, 0 deletions
diff --git a/devtools/client/webconsole/middleware/performance-marker.js b/devtools/client/webconsole/middleware/performance-marker.js
new file mode 100644
index 0000000000..93fcee279c
--- /dev/null
+++ b/devtools/client/webconsole/middleware/performance-marker.js
@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const {
+  MESSAGES_ADD,
+} = require("resource://devtools/client/webconsole/constants.js");
+
+const {
+  createPerformanceMarkerMiddleware,
+} = require("resource://devtools/client/shared/redux/middleware/performance-marker.js");
+
+module.exports = function (sessionId) {
+  return createPerformanceMarkerMiddleware({
+    [MESSAGES_ADD]: {
+      label: "WebconsoleAddMessages",
+      sessionId,
+      getMarkerDescription({ action, state }) {
+        const { messages } = action;
+        const totalMessageCount = state.messages.mutableMessagesById.size;
+        return `${messages.length} messages handled, store now has ${totalMessageCount} messages`;
+      },
+    },
+  });
+};