1 files changed, 54 insertions, 0 deletions
diff --git a/toolkit/components/perfmonitoring/PerformanceWatcher-content.js b/toolkit/components/perfmonitoring/PerformanceWatcher-content.js
new file mode 100644
index 000000000..2956cf5d0
--- /dev/null
+++ b/toolkit/components/perfmonitoring/PerformanceWatcher-content.js
@@ -0,0 +1,54 @@
+/* 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";
+
+/**
+ * An API for being informed of slow add-ons and tabs
+ * (content process scripts).
+ */
+
+const { utils: Cu, classes: Cc, interfaces: Ci } = Components;
+const { Services } = Cu.import("resource://gre/modules/Services.jsm", {});
+
+/**
+ * `true` if this is a content process, `false` otherwise.
+ */
+let isContent = Services.appinfo.processType == Services.appinfo.PROCESS_TYPE_CONTENT;
+
+if (isContent) {
+
+const { PerformanceWatcher } = Cu.import("resource://gre/modules/PerformanceWatcher.jsm", {});
+
+let toMsg = function(alerts) {
+  let result = [];
+  for (let {source, details} of alerts) {
+    // Convert xpcom values to serializable data.
+    let serializableSource = {};
+    for (let k of ["groupId", "name", "addonId", "windowId", "isSystem", "processId", "isContentProcess"]) {
+      serializableSource[k] = source[k];
+    }
+
+    let serializableDetails = {};
+    for (let k of ["reason", "highestJank", "highestCPOW"]) {
+      serializableDetails[k] = details[k];
+    }
+    result.push({source:serializableSource, details:serializableDetails});
+  }
+  return result;
+}
+
+PerformanceWatcher.addPerformanceListener({addonId: "*"}, alerts => {
+  Services.cpmm.sendAsyncMessage("performancewatcher-propagate-notifications",
+    {addons: toMsg(alerts)}
+  );
+});
+
+PerformanceWatcher.addPerformanceListener({windowId: 0}, alerts => {
+  Services.cpmm.sendAsyncMessage("performancewatcher-propagate-notifications",
+    {windows: toMsg(alerts)}
+  );
+});
+
+}