Enable windowless-based npapi_test_plugin tests on the Mac.

chrome/test/ui/npapi_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.
 
 #if defined(OS_WIN)
 // windows headers
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #include <comutil.h>
@@ skipping 144 matching lines @@
   automation()->WaitForAppModalDialog(5000);
   scoped_refptr<WindowProxy> window(automation()->GetActiveWindow());
   ASSERT_TRUE(window.get());
   ASSERT_TRUE(window->SimulateOSKeyPress(base::VKEY_ESCAPE, 0));
 
   WaitForFinish("self_delete_plugin_invoke_alert", "1", url,
                 kTestCompleteCookie, kTestCompleteSuccess,
                 kShortWaitTimeout);
 }
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX)
 // Tests if a plugin executing a self deleting script in the context of
 // a synchronous paint event works correctly
 TEST_F(NPAPIVisiblePluginTester,
        DISABLED_SelfDeletePluginInvokeInSynchronousPaint) {
   if (UITest::in_process_renderer())
     return;
 
   show_window_ = true;
   std::wstring test_case = L"execute_script_delete_in_paint.html";
   GURL url = GetTestUrl(L"npapi", test_case);
@@ skipping 139 matching lines @@
 TEST_F(NPAPIIncognitoTester, PrivateEnabled) {
   if (UITest::in_process_renderer())
     return;
 
   GURL url = GetTestUrl(L"npapi", L"private.html?private");
   NavigateToURL(url);
   WaitForFinish("private", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, kShortWaitTimeout);
 }
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_MACOSX)
 // Test a browser hang due to special case of multiple
 // plugin instances indulged in sync calls across renderer.
 TEST_F(NPAPIVisiblePluginTester, MultipleInstancesSyncCalls) {
   if (UITest::in_process_renderer())
     return;
 
   GURL url = GetTestUrl(L"npapi", L"multiple_instances_sync_calls.html");
   NavigateToURL(url);
   WaitForFinish("multiple_instances_sync_calls", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, kShortWaitTimeout);
@@ skipping 82 matching lines @@
   GURL url(URLRequestMockHTTPJob::GetMockUrl(
                FilePath(FILE_PATH_LITERAL(
                             "npapi/plugin_url_request_referrer_test.html"))));
 
   NavigateToURL(url);
 
   WaitForFinish("plugin_referrer_test", "1", url, kTestCompleteCookie,
                 kTestCompleteSuccess, kShortWaitTimeout);
 }