Upstream Chrome on iOS source code [3/11].

ios/chrome/browser/ui/bookmarks/bookmark_home_waiting_view.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 IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_HOME_WAITING_VIEW_H_
+#define IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_HOME_WAITING_VIEW_H_
+
+#import <UIKit/UIKit.h>
+
+#include "base/ios/block_types.h"
+
+// Displays a waiting UI for BookmarkHomeTabletNTPController and
+// BookmarkHomeHandsetController.
+// It displays a gray background and an activity indicator.
+// The activity indicator appears after a delay, starting from the moment
+// |startWaiting| is called.
+@interface BookmarkHomeWaitingView : UIView
+
+// Call this method when this view is added to the visible view hierarchy.
+// After a delay, an activity indicator will be presented if this view is still
+// in the view hierarchy at that time.
+- (void)startWaiting;
+
+// Call this method when this view is removed from the visible view hierarchy.
+// |completion| will be called when this view is done animating out.
+- (void)stopWaitingWithCompletion:(ProceduralBlock)completion;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_HOME_WAITING_VIEW_H_