Let pyauto create an attached webdriver instance to manipulate web pages.

chrome/test/ui/named_interface_uitest.cc

Index: chrome/test/ui/named_interface_uitest.cc
diff --git a/chrome/test/ui/named_interface_uitest.cc b/chrome/test/ui/named_interface_uitest.cc
index 6f94722a690c1511139d9580eacfd52f7b88c89b..614243ed11f5ce0f39ebdf3b0a0eefedc7162ad6 100644
--- a/chrome/test/ui/named_interface_uitest.cc
+++ b/chrome/test/ui/named_interface_uitest.cc
@@ -27,7 +27,11 @@ class NamedInterfaceTest : public UITest {
     if (channel_path.empty())
       channel_path = ProxyLauncher::kDefaultInterfacePath;
 
-    return new NamedProxyLauncher(channel_path, true, true);
+    NamedProxyLauncher::InitParams params;
+    params.launch_browser = true;
+    params.disconnect_on_failure = true;
+    params.wait_for_server_channel = true;
+    return new NamedProxyLauncher(channel_path, params);
   }
 };