[ios clean] Add placeholder for NTP bookmarks, chrome home and open tabs.

ios/clean/chrome/browser/ui/bookmarks/bookmarks_coordinator.h

Index: ios/clean/chrome/browser/ui/bookmarks/bookmarks_coordinator.h
diff --git a/ios/clean/chrome/browser/ui/bookmarks/bookmarks_coordinator.h b/ios/clean/chrome/browser/ui/bookmarks/bookmarks_coordinator.h
new file mode 100644
index 0000000000000000000000000000000000000000..1493cf927d4d048d3bf342ab6b97ee69b4a35380
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/bookmarks/bookmarks_coordinator.h
@@ -0,0 +1,17 @@
+// Copyright 2017 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_CLEAN_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARKS_COORDINATOR_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARKS_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+
+#import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator.h"
+
+// A coordinator for the bookmarks UI, which can be presented modally on its
+// own or inside the NTP.
+@interface BookmarksCoordinator : BrowserCoordinator
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_BOOKMARKS_BOOKMARKS_COORDINATOR_H_