Re-enable the initialization of SharedWorkerWatcher instances

Bug: 1013168
Change-Id: I47b8d316977615bf96637c60d2141aa0da9a3978
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1865606
Commit-Queue: Sigurður Ásgeirsson <siggi@chromium.org>
Reviewed-by: Sigurður Ásgeirsson <siggi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707343}

chrome/browser/performance_manager/chrome_browser_main_extra_parts_performance_manager.cc

@@ -152,11 +152,13 @@ void ChromeBrowserMainExtraPartsPerformanceManager::Observe(
     const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_PROFILE_CREATED: {
-      // TODO(1013168): Create the worker watchers here.
+      Profile* profile = content::Source<Profile>(source).ptr();
+      CreateSharedWorkerWatcher(profile);
       break;
     }
     case chrome::NOTIFICATION_PROFILE_DESTROYED: {
-      // TODO(1013168): Delete the worker watchers here.
+      Profile* profile = content::Source<Profile>(source).ptr();
+      DeleteSharedWorkerWatcher(profile);
       break;
     }
     default: