Simulate transient error and verify exponential backoff.

net/tools/testserver/testserver.py

Index: net/tools/testserver/testserver.py
diff --git a/net/tools/testserver/testserver.py b/net/tools/testserver/testserver.py
index 02e1138448385422f2770beb9cd434fc8d7a69d2..4b2dcd1e746bf5aa7cd6d9dc557c65dede49630f 100755
--- a/net/tools/testserver/testserver.py
+++ b/net/tools/testserver/testserver.py
@@ -1405,7 +1405,8 @@ class SyncPageHandler(BasePageHandler):
   def __init__(self, request, client_address, sync_http_server):
     get_handlers = [self.ChromiumSyncMigrationOpHandler,
                     self.ChromiumSyncTimeHandler,
-                    self.ChromiumSyncBirthdayErrorOpHanlder]
+                    self.ChromiumSyncBirthdayErrorOpHanlder,
+                    self.ChromiumSyncTransientErrorOpHandler]
     post_handlers = [self.ChromiumSyncCommandHandler,
                      self.ChromiumSyncTimeHandler]
     BasePageHandler.__init__(self, request, client_address,
@@ -1480,12 +1481,17 @@ class SyncPageHandler(BasePageHandler):
     self.wfile.write(raw_reply)
     return True;
 
-  def ChromiumsyncTransientErrorOpHandler(self):
-    test_name = "/chromiumsync/birthdayerror"
-    if not self._shouldHandleRequest(test_name):
+  def ChromiumSyncTransientErrorOpHandler(self):
+    test_name = "/chromiumsync/transienterror"
+    if not self._ShouldHandleRequest(test_name):
       return False
-    result, raw_reply = self.server._sync_handler.HandleSetTransientError
-
+    result, raw_reply = self.server._sync_handler.HandleSetTransientError()
+    self.send_response(result)
+    self.send_header('Content-Type', 'text/html')
+    self.send_header('Content-Length', len(raw_reply))
+    self.end_headers()
+    self.wfile.write(raw_reply)
+    return True;
 
 def MakeDataDir():
   if options.data_dir: