(Mac)Views: Widgets focus first View in traversal order if initial focus fails.

ui/views/test/views_test_helper_mac.h

 // Copyright 2014 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.
 
 #ifndef UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_
 #define UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_
 
 #include <memory>
 
 #include "base/macros.h"
 #include "ui/views/test/views_test_helper.h"
 
 namespace ui {
 namespace test {
 class ScopedFakeFullKeyboardAccess;
 class ScopedFakeNSWindowFocus;
 class ScopedFakeNSWindowFullscreen;
 }
 class ScopedAnimationDurationScaleMode;
 }
 
 namespace views {
 
+class Widget;
+
 class ViewsTestHelperMac : public ViewsTestHelper {
  public:
   ViewsTestHelperMac();
   ~ViewsTestHelperMac() override;
 
   // ViewsTestHelper:
   void SetUp() override;
   void TearDown() override;
+  void SetFullKeyboardAccessState(Widget* widget, bool new_state) override;
 
  private:
   // Disable animations during tests.
   std::unique_ptr<ui::ScopedAnimationDurationScaleMode> zero_duration_mode_;
 
   // When using desktop widgets on Mac, window activation is asynchronous
   // because the window server is involved. A window may also be deactivated by
   // a test running in parallel, making it flaky. In non-interactive/sharded
   // tests, |faked_focus_| is initialized, permitting a unit test to "fake" this
   // activation, causing it to be synchronous and per-process instead.
@@ skipping 11 matching lines @@
   // default.
   std::unique_ptr<ui::test::ScopedFakeFullKeyboardAccess>
       faked_full_keyboard_access_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewsTestHelperMac);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_TEST_VIEWS_TEST_HELPER_MAC_H_