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

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

Index: ios/clean/chrome/browser/ui/commands/ntp_commands.h
diff --git a/ios/clean/chrome/browser/ui/commands/ntp_commands.h b/ios/clean/chrome/browser/ui/commands/ntp_commands.h
new file mode 100644
index 0000000000000000000000000000000000000000..693894398082cbfdc7d9acff81310f344ea8d0e4
--- /dev/null
+++ b/ios/clean/chrome/browser/ui/commands/ntp_commands.h
@@ -0,0 +1,21 @@
+// 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_NTP_COMMANDS_H_
+#define IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_NTP_COMMANDS_H_
+
+// Command protocol for commands relating to the Commands UI.
+// (Commands are for communicating into or within the coordinator layer).
+@protocol NTPCommands
+// Display a Chrome Home panel inside the NTP.
+- (void)showNTPHomePanel;
+// Display a bookmarks panel inside the NTP on iPad or present a bookmarks panel
+// on iPhone.
+- (void)showNTPBookmarksPanel;
+// Display a recent tabs panel inside the NTP on iPad or present a bookmarks
+// panel on iPhone.
+- (void)showNTPRecentTabsPanel;
+@end
+
+#endif  // IOS_CLEAN_CHROME_BROWSER_UI_COMMANDS_NTP_COMMANDS_H_