Delay bookmarks load while the profile is loading.

chrome/browser/automation/testing_automation_provider.cc

Index: chrome/browser/automation/testing_automation_provider.cc
diff --git a/chrome/browser/automation/testing_automation_provider.cc b/chrome/browser/automation/testing_automation_provider.cc
index ce791d5ea52547121d24852f64fb255112dfc6d2..342bd97475e9aa09d64278bd720369255f4c74ce 100644
--- a/chrome/browser/automation/testing_automation_provider.cc
+++ b/chrome/browser/automation/testing_automation_provider.cc
@@ -12,6 +12,7 @@
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
+#include "base/deferred_sequenced_task_runner.h"
 #include "base/files/file_path.h"
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
@@ -1265,7 +1266,7 @@ void TestingAutomationProvider::GetBookmarksAsJSON(
   scoped_refptr<BookmarkStorage> storage(
       new BookmarkStorage(browser->profile(),
                           bookmark_model,
-                          browser->profile()->GetIOTaskRunner()));
+                          browser->profile()->GetBookmarksTaskRunner()));
   if (!storage->SerializeData(&bookmarks_as_json)) {
     reply.SendError("Failed to serialize bookmarks");
     return;