Delay bookmarks load while the profile is loading.

chrome/test/base/testing_profile.cc

Index: chrome/test/base/testing_profile.cc
diff --git a/chrome/test/base/testing_profile.cc b/chrome/test/base/testing_profile.cc
index 82067b18218d75bcdcf2bfadb239684e533be444..45f0dc71dbbde996d948350740ef95a86b5c4b10 100644
--- a/chrome/test/base/testing_profile.cc
+++ b/chrome/test/base/testing_profile.cc
@@ -8,6 +8,7 @@
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
+#include "base/deferred_sequenced_task_runner.h"
 #include "base/file_util.h"
 #include "base/message_loop_proxy.h"
 #include "base/path_service.h"
@@ -475,6 +476,15 @@ scoped_refptr<base::SequencedTaskRunner> TestingProfile::GetIOTaskRunner() {
   return MessageLoop::current()->message_loop_proxy();
 }
 
+scoped_refptr<base::DeferredSequencedTaskRunner>
+    TestingProfile::GetBookmarksTaskRunner() {
+  if (!bookmarks_task_runner_) {
+    bookmarks_task_runner_ =
+        new base::DeferredSequencedTaskRunner(GetIOTaskRunner());
+  }
+  return bookmarks_task_runner_;
+}
+
 TestingPrefServiceSyncable* TestingProfile::GetTestingPrefService() {
   if (!prefs_.get())
     CreateTestingPrefService();