Simulate transient error and verify exponential backoff.

chrome/test/live_sync/live_sync_test.cc

Index: chrome/test/live_sync/live_sync_test.cc
diff --git a/chrome/test/live_sync/live_sync_test.cc b/chrome/test/live_sync/live_sync_test.cc
index 523029665a740eab0383a4b747d7cca77be7542f..ed7062f8b59246e6863f015f3f803cdc5af5f104 100644
--- a/chrome/test/live_sync/live_sync_test.cc
+++ b/chrome/test/live_sync/live_sync_test.cc
@@ -518,6 +518,14 @@ void LiveSyncTest::TriggerBirthdayError() {
             browser()->GetSelectedTabContents()->GetTitle());
 }
 
+void LiveSyncTest::TriggerTransientError() {
+  ASSERT_TRUE(ServerSupportsErrorTriggering());
+  std::string path = "chromiumsync/transienterror";
+  ui_test_utils::NavigateToURL(browser(), sync_server_.GetURL(path));
+  ASSERT_EQ(ASCIIToUTF16("Transient error"),
+            browser()->GetSelectedTabContents()->GetTitle());
+}
+
 void LiveSyncTest::SetProxyConfig(net::URLRequestContextGetter* context_getter,
                                   const net::ProxyConfig& proxy_config) {
   base::WaitableEvent done(false, false);