Experiment with redirecting all BrowserThreads (but UI/IO) to TaskScheduler

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index 352f1568fd414fc785cd452bef003955c8e897f5..6c01bb642578e08ac405e462c73c21e3bb0b0fa7 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -324,8 +324,8 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
       std::vector<base::SchedulerWorkerPoolParams>* params_vector,
       base::TaskScheduler::WorkerPoolIndexForTraitsCallback*
           index_to_traits_callback) override;
-
   void PerformExperimentalTaskSchedulerRedirections() override;
+  bool RedirectNonUINonIOBrowserThreadsToTaskScheduler() override;
 
  private:
   friend class DisableWebRtcEncryptionFlagTest;