Add default testing command line flags in UITestBase instead of ProxyLauncher.

chrome/test/webdriver/webdriver_server.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <signal.h>
 #include <stdlib.h>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
@@ skipping 287 matching lines @@
     std::cerr << "Port already in use. Exiting..." << std::endl;
 #if defined(OS_WIN)
     return WSAEADDRINUSE;
 #else
     return EADDRINUSE;
 #endif
   }
 
   // The tests depend on parsing the first line ChromeDriver outputs,
   // so all other logging should happen after this.
-  std::cout << "Started ChromeDriver" << std::endl
-            << "port=" << port << std::endl
-            << "version=" << chrome::kChromeVersion << std::endl;
-  if (logging_success)
-    std::cout << "log=" << FileLog::Get()->path().value() << std::endl;
-  else
-    std::cout << "Log file could not be created" << std::endl;
+  if (!cmd_line->HasSwitch("silent")) {
+    std::cout << "Started ChromeDriver" << std::endl
+              << "port=" << port << std::endl
+              << "version=" << chrome::kChromeVersion << std::endl;
+    if (logging_success)
+      std::cout << "log=" << FileLog::Get()->path().value() << std::endl;
+    else
+      std::cout << "Log file could not be created" << std::endl;
+  }
 
   // Run until we receive command to shutdown.
   // Don't call mg_stop because mongoose will hang if clients are still
   // connected when keep-alive is enabled.
   shutdown_event.Wait();
 
   return (EXIT_SUCCESS);
 }
 
 }  // namespace webdriver
 
 int main(int argc, char *argv[]) {
   CommandLine::Init(argc, argv);
   return webdriver::RunChromeDriver();
 }