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

chrome/test/startup/feature_startup_test.cc

 // Copyright (c) 2006-2008 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 "base/file_util.h"
 #include "base/gfx/rect.h"
 #include "base/path_service.h"
 #include "base/perftimer.h"
 #include "base/time.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/common/chrome_paths.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/test/automation/browser_proxy.h"
 #include "chrome/test/automation/window_proxy.h"
 #include "chrome/test/ui/ui_test.h"
 #include "net/base/net_util.h"
 
 using base::TimeDelta;
 
 namespace {
 
 // Returns the directory name where the "typical" user data is that we use for
@@ skipping 26 matching lines @@
     PrintResultList("new_tab", "", label, times, "ms", important);
   }
 
   // Run the test, by bringing up a browser and timing the new tab startup.
   // |want_warm| is true if we should output warm-disk timings, false if
   // we should report cold timings.
   void RunStartupTest(const char* label, bool want_warm, bool important) {
     // Install the location of the test profile file.
     set_template_user_data(ComputeTypicalUserDataSource().ToWStringHack());
 
+    // Disable the first run notification because it has an animation which
+    // masks any real performance regressions.
+    launch_arguments_.AppendSwitch(switches::kDisableNewTabFirstRun);
+
     TimeDelta timings[kNumCycles];
     for (int i = 0; i < kNumCycles; ++i) {
       UITest::SetUp();
 
       // Switch to the "new tab" tab, which should be any new tab after the
       // first (the first is about:blank).
       scoped_refptr<BrowserProxy> window(automation()->GetBrowserWindow(0));
       ASSERT_TRUE(window.get());
 
       // We resize the window so that we hit the normal layout of the NTP and
@@ skipping 34 matching lines @@
 // TODO(pamg): run these tests with a reference build?
 TEST_F(NewTabUIStartupTest, PerfCold) {
   RunStartupTest("tab_cold", false /* cold */, true /* important */);
 }
 
 TEST_F(NewTabUIStartupTest, DISABLED_PerfWarm) {
   RunStartupTest("tab_warm", true /* warm */, false /* not important */);
 }
 
 }  // namespace