Mark WorkerTest.QueuedSharedWorkerStartedFromOtherTab as flaky on Mac.

chrome/worker/worker_uitest.cc

 // Copyright (c) 2009 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 "base/file_path.h"
 #include "base/string_util.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/browser/worker_host/worker_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
@@ skipping 619 matching lines @@
                                         FilePath(kShutdownSharedWorkerFile));
   url2 = GURL(url2.spec() + "?id=0");
   ASSERT_TRUE(window->AppendTab(url2));
 
   std::string value = WaitUntilCookieNonEmpty(tab.get(), url,
       kTestCompleteCookie, action_max_timeout_ms());
   ASSERT_STREQ(kTestCompleteSuccess, value.c_str());
   ASSERT_TRUE(WaitForProcessCountToBe(3, max_workers_per_tab));
 }
 
-TEST_F(WorkerTest, QueuedSharedWorkerStartedFromOtherTab) {
+// Only flaky on Mac  http://crbug.com/48148
+#if defined(OS_MACOSX)
+#define MAYBE_QueuedSharedWorkerStartedFromOtherTab \
+    FLAKY_QueuedSharedWorkerStartedFromOtherTab
+#else
+#define MAYBE_QueuedSharedWorkerStartedFromOtherTab \
+    QueuedSharedWorkerStartedFromOtherTab
+#endif
+TEST_F(WorkerTest, MAYBE_QueuedSharedWorkerStartedFromOtherTab) {
   // Tests to make sure that queued shared workers are started up when
   // an instance is launched from another tab.
   int max_workers_per_tab = WorkerService::kMaxWorkersPerTabWhenSeparate;
   GURL url = ui_test_utils::GetTestUrl(FilePath(kTestDir),
                                        FilePath(kManySharedWorkersFile));
   url = GURL(url.spec() + StringPrintf("?count=%d", max_workers_per_tab+1));
 
   scoped_refptr<TabProxy> tab(GetActiveTab());
   ASSERT_TRUE(tab.get());
   ASSERT_TRUE(tab->NavigateToURL(url));
@@ skipping 10 matching lines @@
 
   std::string value = WaitUntilCookieNonEmpty(tab.get(), url,
       kTestCompleteCookie, action_max_timeout_ms());
   ASSERT_STREQ(kTestCompleteSuccess, value.c_str());
   ASSERT_TRUE(WaitForProcessCountToBe(2, max_workers_per_tab+1));
 }
 
 TEST_F(WorkerTest, OpenDatabaseSyncInputs) {
   RunWorkerStorageLayoutTest("open-database-sync-inputs.html");
 }