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 9d1756dec89cfc08ab87e015aae4ddf86b281c50..028c6e7a00d9565493994a425ef2a3932178478f 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -784,6 +784,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   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();
+
   // Binds a new media remoter service to |request|, if supported by the
   // embedder, for the |source| that lives in the render frame represented
   // by |render_frame_host|. This may be called multiple times if there is more