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

ios/clean/chrome/browser/ui/recent_tabs/recent_tabs_coordinator.h

Index: ios/clean/chrome/browser/ui/recent_tabs/recent_tabs_coordinator.h
diff --git a/ios/clean/chrome/browser/ui/recent_tabs/recent_tabs_coordinator.h b/ios/clean/chrome/browser/ui/recent_tabs/recent_tabs_coordinator.h
new file mode 100644
index 0000000000000000000000000000000000000000..cdf85ae47edac094a55348a5b1728a7911badc3e
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/recent_tabs/recent_tabs_coordinator.h
@@ -0,0 +1,16 @@
+// 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_RECENT_TABS_RECENT_TABS_COORDINATOR_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_RECENT_TABS_RECENT_TABS_COORDINATOR_H_
+
+#import <UIKit/UIKit.h>
+#import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator.h"
+
+// A coordinator for the recent tabs UI, which can be presented modally on its
+// own or inside the NTP.
+@interface RecentTabsCoordinator : BrowserCoordinator
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_RECENT_TABS_RECENT_TABS_COORDINATOR_H_