Allow controlling the Instant field trial through a command line flag.

chrome/test/base/test_launcher_utils.cc

 // Copyright (c) 2011 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 "chrome/test/base/test_launcher_utils.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 35 matching lines @@
   if (!command_line->HasSwitch(switches::kPasswordStore))
     command_line->AppendSwitchASCII(switches::kPasswordStore, "basic");
 #endif
 
 #if defined(OS_MACOSX)
   // Use mock keychain on mac to prevent blocking permissions dialogs.
   // TODO(sync): Re-enable when mock keyring works with sync integration tests.
   // See crbug.com/89808.
   // command_line->AppendSwitch(switches::kUseMockKeychain);
 #endif
+
+  // Disable the Instant field trial, which may cause unexpected page loads.
+  command_line->AppendSwitchASCII(switches::kInstantFieldTrial, "disabled");
 }
 
 bool OverrideUserDataDir(const FilePath& user_data_dir) {
   bool success = true;
 
   // PathService::Override() is the best way to change the user data directory.
   // This matches what is done in ChromeMain().
   success = PathService::Override(chrome::DIR_USER_DATA, user_data_dir);
 
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
@@ skipping 14 matching lines @@
                               const std::string& implementation_name) {
   if (command_line->HasSwitch(switches::kUseGL))
     return false;
 
   command_line->AppendSwitchASCII(switches::kUseGL, implementation_name);
 
   return true;
 }
 
 }  // namespace test_launcher_utils