Disable flaky test TaskManagerBrowserTest.IdleWakeups

chrome/browser/task_manager/task_manager_browsertest.cc

Index: chrome/browser/task_manager/task_manager_browsertest.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest.cc b/chrome/browser/task_manager/task_manager_browsertest.cc
index b6ce18844bdf907eab3ad416dfd1e499531f72c6..3ea93cff9a792cfdffd4173416ec3f99409e8f8d 100644
--- a/chrome/browser/task_manager/task_manager_browsertest.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest.cc
@@ -862,8 +862,14 @@ IN_PROC_BROWSER_TEST_F(TaskManagerBrowserTest, JSHeapMemory) {
 }
 
 // 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);