MacViews: Implement Full Keyboard Access.

ui/base/test/scoped_fake_full_keyboard_access.h

+// Copyright 2016 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_BASE_TEST_SCOPED_FAKE_FULL_KEYBOARD_ACCESS_H_
+#define UI_BASE_TEST_SCOPED_FAKE_FULL_KEYBOARD_ACCESS_H_
+
+#include <memory>
+
+#include "base/macros.h"
+
+namespace base {
+namespace mac {
+class ScopedObjCClassSwizzler;
+}
+}
+
+namespace ui {
+namespace test {
+
+// A singleton class which swizzles [NSApp isFullKeyboardAccessEnabled] so
+// that it returns the value set using SetFullKeyboardAccessState.
+class ScopedFakeFullKeyboardAccess {
+ public:
+  ScopedFakeFullKeyboardAccess();
+  ~ScopedFakeFullKeyboardAccess();
+
+  // Returns the ScopedFakeFullKeyboardAccess singleton or null if one hasn't
+  // been created yet.
+  static ScopedFakeFullKeyboardAccess* GetInstance();
+
+  // Set the value to be returned by [NSApp isFullKeyboardAccessEnabled].
+  void SetFullKeyboardAccessState(bool new_state);
+
+ private:
+  std::unique_ptr<base::mac::ScopedObjCClassSwizzler> swizzler_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFakeFullKeyboardAccess);
+};
+
+}  // namespace test
+}  // namespace ui
+
+#endif  // UI_BASE_TEST_SCOPED_FAKE_FULL_KEYBOARD_ACCESS_H_