[MacViews] Enable dragging a window by its caption/draggable areas.

ui/base/test/windowed_nsnotification_observer.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 UI_GFX_TEST_WINDOWED_NSNOTIFICATION_OBSERVER_H_
+#define UI_GFX_TEST_WINDOWED_NSNOTIFICATION_OBSERVER_H_
+
+#import <Cocoa/Cocoa.h>
+
+#import "base/mac/scoped_nsobject.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/run_loop.h"
+
+// Watches for NSNotifications.
+@interface WindowedNSNotificationObserver : NSObject {
+ @private
+  base::scoped_nsobject<NSString> bundleId_;
+  BOOL notificationReceived_;
+  scoped_ptr<base::RunLoop> runLoop_;
+}
+
+// Watch for a notification on the default notification center.
+- (id)initForNotification:(NSString*)name;
+// Watch for a notification on the shared workspace notification center for the
+// given application.
+- (id)initForNotification:(NSString*)name
+              andBundleId:(NSString*)bundleId;
+- (void)wait;
+@end
+
+#endif  // UI_GFX_TEST_WINDOWED_NSNOTIFICATION_OBSERVER_H_
+