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

content/public/browser/content_browser_client.h

Index: content/public/browser/content_browser_client.h
diff --git a/content/public/browser/content_browser_client.h b/content/public/browser/content_browser_client.h
index 437ca897baa4e324a76225cbae39fd7a280b342e..0d9ccbba4a16e44457e4719862b3c0de466c8b2b 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -814,6 +814,10 @@ class CONTENT_EXPORT ContentBrowserClient {
 
   // Performs any necessary PostTask API redirection to the task scheduler.
   virtual void PerformExperimentalTaskSchedulerRedirections() {}
+
+  // If this returns true, all BrowserThreads (but UI/IO) that support it on
+  // this platform will experimentally be redirected to TaskScheduler.
+  virtual bool RedirectNonUINonIOBrowserThreadsToTaskScheduler();
 };
 
 }  // namespace content