Disable first run for the New Tab Cold perf test....

chrome/common/chrome_switches.h

 // Copyright (c) 2006-2009 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 
 #include "base/base_switches.h"
@@ skipping 162 matching lines @@
 
 extern const wchar_t kDisableOmnibox2[];
 
 extern const wchar_t kDisableAudio[];
 extern const wchar_t kSimpleDataSource[];
 
 extern const wchar_t kForceFieldTestNameAndValue[];
 
 extern const wchar_t kNewTabPage[];
 extern const wchar_t kOldNewTabPage[];
+extern const wchar_t kDisableNewTabFirstRun[];
 
 extern const wchar_t kEnableWebResources[];
 
 extern const wchar_t kEnableBenchmarking[];
 
 extern const wchar_t kNoDefaultBrowserCheck[];
 
 extern const wchar_t kPrivacyBlacklist[];
 
 extern const wchar_t kZygoteCmdPrefix[];
@@ skipping 22 matching lines @@
 
 extern const wchar_t kAllowSandboxDebugging[];
 
 extern const wchar_t kDiagnostics[];
 
 extern const wchar_t kEnableCustomJumpList[];
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_