[MacViews] Implement colored window frames.

chrome/browser/ui/test/scoped_fake_nswindow_main_status.h

+// Copyright 2015 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 CHROME_BROWSER_UI_TEST_SCOPED_FAKE_NSWINDOW_MAIN_STATUS_H_
+#define CHROME_BROWSER_UI_TEST_SCOPED_FAKE_NSWINDOW_MAIN_STATUS_H_
+
+#import "base/mac/scoped_objc_class_swizzler.h"
+
+@class NSWindow;
+
+// Simulates a particular NSWindow to report YES for [NSWindow isMainWindow].
+// This allows test coverage of code relying on window focus changes without
+// resorting to an interactive_ui_test.
+class ScopedFakeNSWindowMainStatus {
+ public:
+  explicit ScopedFakeNSWindowMainStatus(NSWindow* window);
+  ~ScopedFakeNSWindowMainStatus();
+
+ private:
+  base::mac::ScopedObjCClassSwizzler swizzler_;
+
+  DISALLOW_COPY_AND_ASSIGN(ScopedFakeNSWindowMainStatus);
+};
+
+#endif  // CHROME_BROWSER_UI_TEST_SCOPED_FAKE_NSWINDOW_MAIN_STATUS_H_