Add an experiment to redirect DOMStorageTaskRunner 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 0d9ccbba4a16e44457e4719862b3c0de466c8b2b..a7d5b8b81d30790bc14aefc72f7cd6feb410b824 100644
--- a/content/public/browser/content_browser_client.h
+++ b/content/public/browser/content_browser_client.h
@@ -815,6 +815,10 @@ class CONTENT_EXPORT ContentBrowserClient {
   // Performs any necessary PostTask API redirection to the task scheduler.
   virtual void PerformExperimentalTaskSchedulerRedirections() {}
 
+  // Returns true if the DOMStorageTaskRunner should be redirected to the task
+  // scheduler.
+  virtual bool ShouldRedirectDOMStorageTaskRunner();
+
   // If this returns true, all BrowserThreads (but UI/IO) that support it on
   // this platform will experimentally be redirected to TaskScheduler.
   virtual bool RedirectNonUINonIOBrowserThreadsToTaskScheduler();