Disable all the tests that are flaking more than 5% on ChromeOS builders.

chrome/browser/apps/web_view_browsertest.cc

 // Copyright 2013 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 "apps/ui/native_app_window.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/apps/app_browsertest_util.h"
@@ skipping 1442 matching lines @@
                             &cookie_size, &cookie_value);
   EXPECT_EQ("persist1=true", cookie_value);
   ui_test_utils::GetCookies(GURL("http://localhost"),
                             persistent_partition_contents3,
                             &cookie_size, &cookie_value);
   EXPECT_EQ("persist2=true", cookie_value);
 }
 
 // This is the post-reset portion of the StoragePersistence test.  See
 // PRE_StoragePersistence for main comment.
-IN_PROC_BROWSER_TEST_F(WebViewTest, StoragePersistence) {
+#if defined(OS_CHROMEOS)
+// http://crbug.com/223888
+#define MAYBE_StoragePersistence DISABLED_StoragePersistence
+#else
+#define MAYBE_StoragePersistence StoragePersistence
+#endif
+IN_PROC_BROWSER_TEST_F(WebViewTest, MAYBE_StoragePersistence) {
   ASSERT_TRUE(StartEmbeddedTestServer());
 
   // We don't care where the main browser is on this test.
   GURL blank_url("about:blank");
 
   // The first two partitions will be used to set cookies and ensure they are
   // shared. The named partition is used to ensure that cookies are isolated
   // between partitions within the same app.
   content::WebContents* cookie_contents1;
   content::WebContents* cookie_contents2;
@@ skipping 765 matching lines @@
 IN_PROC_BROWSER_TEST_F(WebViewTest, Shim_TestFindAPI_findupdate) {
   TestHelper("testFindAPI_findupdate", "web_view/shim", NO_TEST_SERVER);
 }
 
 // <webview> screenshot capture fails with ubercomp.
 // See http://crbug.com/327035.
 IN_PROC_BROWSER_TEST_F(WebViewCaptureTest,
                        DISABLED_Shim_ScreenshotCapture) {
   TestHelper("testScreenshotCapture", "web_view/shim", NO_TEST_SERVER);
 }