[Sync] Add client-side plumbing for server control of sessions commit delay

chrome/browser/sync/sessions/test_util.cc

Index: chrome/browser/sync/sessions/test_util.cc
diff --git a/chrome/browser/sync/sessions/test_util.cc b/chrome/browser/sync/sessions/test_util.cc
index 6f69de6d7abc37a7447d8200be9063c8c234b841..65d307b7387adddf3251381faa0c0a43a029787d 100644
--- a/chrome/browser/sync/sessions/test_util.cc
+++ b/chrome/browser/sync/sessions/test_util.cc
@@ -52,6 +52,11 @@ void SimulatePollIntervalUpdateImpl(sessions::SyncSession* session,
   session->delegate()->OnReceivedLongPollIntervalUpdate(new_poll);
 }
 
+void SimulateSessionsCommitDelayUpdateImpl(sessions::SyncSession* session,
+    const base::TimeDelta& new_delay) {
+  session->delegate()->OnReceivedSessionsCommitDelay(new_delay);
+}
+
 }  // namespace test_util
 }  // namespace sessions
 }  // namespace browser_sync