Disable the PrerenderBrowserTest.PageLoadMetricsPrerender test.

chrome/browser/prerender/prerender_browsertest.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 <stddef.h>
 #include <deque>
 #include <set>
 #include <string>
 #include <unordered_map>
 #include <utility>
@@ skipping 1074 matching lines @@
   histogram_tester().ExpectTotalCount(
       "PageLoad.PaintTiming.NavigationToFirstContentfulPaint", 1);
 
   // Histogram only emitted during a prerender, which should not happen here.
   histogram_tester().ExpectTotalCount(
       "Prerender.websame_PrefetchTTFCP.Warm.Cacheable.Visible", 0);
 }
 
 // Checks that the correct page load metrics observers are produced with a
 // prerender.
-IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, PageLoadMetricsPrerender) {
+// TODO(https://crbug.com/678976) Fails on ChromeOS and Linux.
+#if defined(OS_CHROMEOS) || defined(OS_LINUX)
+#define MAYBE_PageLoadMetricsPrerender DISABLED_PageLoadMetricsPrerender
+#else
+#define MAYBE_PageLoadMetricsPrerender PageLoadMetricsPrerender
+#endif
+IN_PROC_BROWSER_TEST_F(PrerenderBrowserTest, MAYBE_PageLoadMetricsPrerender) {
   test_utils::FirstContentfulPaintManagerWaiter* prerender_fcp_waiter =
       test_utils::FirstContentfulPaintManagerWaiter::Create(
           GetPrerenderManager());
   PrerenderTestURL("/prerender/prerender_page.html", FINAL_STATUS_USED, 1);
   NavigateToDestURL();
   prerender_fcp_waiter->Wait();
 
   histogram_tester().ExpectTotalCount(
       "Prerender.websame_PrefetchTTFCP.Warm.Cacheable.Visible", 1);
 
@@ skipping 2645 matching lines @@
       browser()->tab_strip_model()->GetActiveWebContents();
   bool display_test_result = false;
   ASSERT_TRUE(content::ExecuteScriptAndExtractBool(web_contents,
                                                    "DidDisplayReallyPass()",
                                                    &display_test_result));
   ASSERT_TRUE(display_test_result);
 }
 #endif  // !defined(DISABLE_NACL)
 
 }  // namespace prerender