MacViews: Implement Full Keyboard Access.

ui/base/test/scoped_fake_full_keyboard_access.mm

Index: ui/base/test/scoped_fake_full_keyboard_access.mm
diff --git a/ui/base/test/scoped_fake_full_keyboard_access.mm b/ui/base/test/scoped_fake_full_keyboard_access.mm
new file mode 100644
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+++ b/ui/base/test/scoped_fake_full_keyboard_access.mm
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+// 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.
+
+#import "ui/base/test/scoped_fake_full_keyboard_access.h"
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/mac/scoped_objc_class_swizzler.h"
+
+namespace {
+
+bool g_full_keyboard_access_mode = false;
+
+}  // namespace
+
+// Donates testing implementation of
+// [NSApplication isFullKeyboardAccessEnabled].
+@interface FakeNSAppKeyboardAccessDonor : NSObject
+@end
+
+@implementation FakeNSAppKeyboardAccessDonor
+
+- (BOOL)isFullKeyboardAccessEnabled {
+  return g_full_keyboard_access_mode;
+}
+
+@end
+
+namespace ui {
+namespace test {
+
+ScopedFakeFullKeyboardAccess::ScopedFakeFullKeyboardAccess()
+    : swizzler_(new base::mac::ScopedObjCClassSwizzler(
+          [NSApplication class],
+          [FakeNSAppKeyboardAccessDonor class],
+          @selector(isFullKeyboardAccessEnabled))) {}
+
+ScopedFakeFullKeyboardAccess::~ScopedFakeFullKeyboardAccess() {}
+
+void ScopedFakeFullKeyboardAccess::SetFullKeyboardAccessState(bool new_state) {
+  g_full_keyboard_access_mode = new_state;
+}
+
+}  // namespace test
+}  // namespace ui