Disable flaky WebViewFocusInteractiveTest.FocusAndVisibility test on MacOS

chrome/browser/apps/guest_view/web_view_interactive_browsertest.cc

 // Copyright 2013 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 "base/location.h"
 #include "base/macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
@@ skipping 1307 matching lines @@
   // Now verify that the selection text propagates properly to RWHV.
   content::RenderWidgetHostView* guest_rwhv =
       guest_web_contents()->GetRenderWidgetHostView();
   ASSERT_TRUE(guest_rwhv);
   std::string selected_text = base::UTF16ToUTF8(guest_rwhv->GetSelectedText());
   ASSERT_TRUE(selected_text.size() >= 10u);
   ASSERT_EQ("AAAAAAAAAA", selected_text.substr(0, 10));
 }
 #endif
 
-IN_PROC_BROWSER_TEST_F(WebViewFocusInteractiveTest, FocusAndVisibility) {
+// Flaky on MacOS builders. https://crbug.com/670008
+#if defined(OS_MACOSX)
+#define MAYBE_FocusAndVisibility DISABLED_FocusAndVisibility
+#else
+#define MAYBE_FocusAndVisibility FocusAndVisibility
+#endif
+
+IN_PROC_BROWSER_TEST_F(WebViewFocusInteractiveTest, MAYBE_FocusAndVisibility) {
   ASSERT_TRUE(StartEmbeddedTestServer());
   LoadAndLaunchPlatformApp("web_view/focus_visibility",
                            "WebViewInteractiveTest.LOADED");
   ExtensionTestMessageListener test_init_listener(
       "WebViewInteractiveTest.WebViewInitialized", false);
   SendMessageToEmbedder("init");
   test_init_listener.WaitUntilSatisfied();
   // Send several tab-keys. The button inside webview should receive focus at
   // least once.
   for (size_t i = 0; i < 4; ++i)
@@ skipping 118 matching lines @@
   ASSERT_TRUE(ui_test_utils::SendKeyPressToWindowSync(
       GetPlatformAppWindow(), ui::VKEY_Z, false, false, false, false));
 
   next_step_listener.Reset();
   EXPECT_TRUE(content::ExecuteScript(
       embedder_web_contents(),
       "window.runCommand('testKeyboardFocusRunNextStep', 'aBcxYz');"));
 
   ASSERT_TRUE(next_step_listener.WaitUntilSatisfied());
 }