Disable flaky test TaskManagerBrowserTest.IdleWakeups

chrome/browser/task_manager/task_manager_browsertest.cc

 // Copyright 2016 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 <vector>
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "base/path_service.h"
@@ skipping 844 matching lines @@
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerStatToExceed(
       MatchTab("title1.html"), ColumnSpecifier::V8_MEMORY, minimal_heap_size));
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerStatToExceed(
       MatchTab("title1.html"), ColumnSpecifier::V8_MEMORY_USED,
       minimal_heap_size));
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, MatchAnyTab()));
   ASSERT_NO_FATAL_FAILURE(WaitForTaskManagerRows(1, MatchTab("title1.html")));
 }
 
 // Checks that task manager counts idle wakeups.
+// Flakily fails on Mac: http://crbug.com/639939
+#if defined(OS_MACOSX)
+#define MAYBE_IdleWakeups DISABLED_IdleWakeups
+#else
+#define MAYBE_IdleWakeups IdleWakeups
+#endif  // defined(OS_MACOSX)
 IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest,
-                       IdleWakeups) {
+                       MAYBE_IdleWakeups) {
   ShowTaskManager();
   model()->ToggleColumnVisibility(ColumnSpecifier::IDLE_WAKEUPS);
 
   ui_test_utils::NavigateToURL(browser(), GetTestURL());
 
   std::string test_js =
     "function myWait() {\n"
     "  setTimeout(function() { myWait(); }, 1)\n"
     "}\n"
     "myWait();\n"
@@ skipping 409 matching lines @@
 
     // Because the subframes for tab 2 are nested, their order is deterministic.
     EXPECT_EQ("Subframe: http://a.com/",
               base::UTF16ToUTF8(model()->GetRowTitle(tab2_start + 1)));
     EXPECT_EQ("Subframe: http://c.com/",
               base::UTF16ToUTF8(model()->GetRowTitle(tab2_start + 2)));
     EXPECT_EQ("Subframe: http://b.com/",
               base::UTF16ToUTF8(model()->GetRowTitle(tab2_start + 3)));
   }
 }