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 3f7c9ead94d7a15e11e07d1016c3ff86e1d23605..7d6c3ccd5831c3a8d69eedc74b8a9c2b9c257099 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -769,6 +769,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Returns an instance of MemoryCoordinatorDelegate.
   virtual std::unique_ptr<MemoryCoordinatorDelegate>
   GetMemoryCoordinatorDelegate();
+
+  // 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