Disable all the browser_tests that are flaking more than 5% of the time on trybots.

chrome/browser/extensions/extension_tabs_apitest.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 "chrome/browser/extensions/extension_apitest.h"
 
 #include "base/prefs/pref_service.h"
 #include "chrome/browser/prefs/incognito_mode_prefs.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 58 matching lines @@
 
 // crbug.com/149924
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, DISABLED_TabDuplicate) {
   ASSERT_TRUE(RunExtensionSubtest("tabs/basics", "duplicate.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, TabSize) {
   ASSERT_TRUE(RunExtensionSubtest("tabs/basics", "tab_size.html")) << message_;
 }
 
-IN_PROC_BROWSER_TEST_F(ExtensionApiTest, TabUpdate) {
+// Flaky on linux: http://crbug.com/396364
+#if defined(OS_LINUX)
+#define MAYBE_TabUpdate DISABLED_TabUpdate
+#else
+#define MAYBE_TabUpdate TabUpdate
+#endif
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MAYBE_TabUpdate) {
   ASSERT_TRUE(RunExtensionSubtest("tabs/basics", "update.html")) << message_;
 }
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, TabPinned) {
   ASSERT_TRUE(RunExtensionSubtest("tabs/basics", "pinned.html")) << message_;
 }
 
 // Flaky on windows: http://crbug.com/238667
 #if defined(OS_WIN)
 #define MAYBE_TabMove DISABLED_TabMove
@@ skipping 154 matching lines @@
       << message_;
 }
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, DISABLED_GetViewsOfCreatedWindow) {
   ASSERT_TRUE(RunExtensionSubtest("tabs/basics", "get_views_window.html"))
       << message_;
 }
 
 // Adding a new test? Awesome. But API tests are the old hotness. The
 // new hotness is extension_test_utils. See tabs_test.cc for an example.
 // We are trying to phase out many uses of API tests as they tend to be flaky.