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

ios/clean/chrome/browser/ui/commands/tab_commands.h

Index: ios/clean/chrome/browser/ui/commands/tab_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/tab_commands.h b/ios/clean/chrome/browser/ui/commands/tab_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..d2f498cfb57fe4c4f7c8fa8e5571972892042bae
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/tab_commands.h
@@ -0,0 +1,16 @@
+// Copyright 2016 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_COMMANDS_TAB_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_TAB_COMMANDS_H_
+
+#import "ios/web/public/navigation_manager.h"
+
+// Commands relating to the Settings UI.
+@protocol TabCommands
+// Open a URL.
+- (void)loadURL:(web::NavigationManager::WebLoadParams)params;
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_TAB_COMMANDS_H_