Mark new tab tests as flaky.

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/path_service.h"
 #include "base/perftimer.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 142 matching lines @@
       UITest::TearDown();
     }
 
     PrintTimings("script_start", scriptstart_times, false /* important */);
     PrintTimings("domcontent_loaded", domcontentloaded_times,
                  false /* important */);
     PrintTimings("onload", onload_times, false /* important */);
   }
 };
 
-TEST_F(NewTabUIStartupTest, PerfRefCold) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_PerfRefCold) {
   UseReferenceBuild();
   RunStartupTest("tab_cold_ref", false /* cold */, true /* important */,
                  ProxyLauncher::DEFAULT_THEME);
 }
 
-TEST_F(NewTabUIStartupTest, PerfCold) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_PerfCold) {
   RunStartupTest("tab_cold", false /* cold */, true /* important */,
                  ProxyLauncher::DEFAULT_THEME);
 }
 
-TEST_F(NewTabUIStartupTest, PerfRefWarm) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_PerfRefWarm) {
   UseReferenceBuild();
   RunStartupTest("tab_warm_ref", true /* warm */, true /* not important */,
                  ProxyLauncher::DEFAULT_THEME);
 }
 
-TEST_F(NewTabUIStartupTest, PerfWarm) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_PerfWarm) {
   RunStartupTest("tab_warm", true /* warm */, true /* not important */,
                  ProxyLauncher::DEFAULT_THEME);
 }
 
-TEST_F(NewTabUIStartupTest, ComplexThemeCold) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_ComplexThemeCold) {
   RunStartupTest("tab_complex_theme_cold", false /* cold */,
                  false /* not important */,
                  ProxyLauncher::COMPLEX_THEME);
 }
 
-TEST_F(NewTabUIStartupTest, NewTabTimingTestsCold) {
+// FLAKY: http://crbug.com/69940
+TEST_F(NewTabUIStartupTest, FLAKY_NewTabTimingTestsCold) {
   RunNewTabTimingTest();
 }
 
 #if defined(OS_LINUX)
 TEST_F(NewTabUIStartupTest, GtkThemeCold) {
   RunStartupTest("tab_gtk_theme_cold", false /* cold */,
                  false /* not important */,
                  ProxyLauncher::NATIVE_THEME);
 }
 
 TEST_F(NewTabUIStartupTest, NativeFrameCold) {
   RunStartupTest("tab_custom_frame_cold", false /* cold */,
                  false /* not important */,
                  ProxyLauncher::CUSTOM_FRAME);
 }
 
 TEST_F(NewTabUIStartupTest, NativeFrameGtkThemeCold) {
   RunStartupTest("tab_custom_frame_gtk_theme_cold", false /* cold */,
                  false /* not important */,
                  ProxyLauncher::CUSTOM_FRAME_NATIVE_THEME);
 }
 #endif
 
 }  // namespace