Run ScopedTaskScheduler tasks synchronously.

content/public/test/test_browser_thread_bundle.cc

Index: content/public/test/test_browser_thread_bundle.cc
diff --git a/content/public/test/test_browser_thread_bundle.cc b/content/public/test/test_browser_thread_bundle.cc
index 537e24534c3bda496b4648d0c31e12738d2f2974..e8c8765e7665e5c65cb8625ecb7a6e5543ffb06d 100644
--- a/content/public/test/test_browser_thread_bundle.cc
+++ b/content/public/test/test_browser_thread_bundle.cc
@@ -6,6 +6,7 @@
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
+#include "base/test/scoped_task_scheduler.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/public/test/test_browser_thread.h"
 
@@ -64,6 +65,9 @@ void TestBrowserThreadBundle::Init() {
     message_loop_.reset(new base::MessageLoopForUI());
   }
 
+  task_scheduler_.reset(
+      new base::test::ScopedTaskScheduler(message_loop_.get()));
+
   ui_thread_.reset(
       new TestBrowserThread(BrowserThread::UI, message_loop_.get()));