Add CommandDispatcher to BrowserViewController.

ios/chrome/browser/ui/ntp/google_landing_commands.h

+// 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_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_COMMANDS_H_
+#define IOS_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_COMMANDS_H_
+
+#include "components/ntp_tiles/ntp_tile.h"
+#include "components/ntp_tiles/tile_visual_type.h"
+#import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
+#import "ios/chrome/browser/ui/url_loader.h"
+
+// Commands relating to the Google Landing.
+// TODO(crbug.com/694750): This commands will evolve over time and move
+// into different command protocols.
+@protocol GoogleLandingCommands
+
+// Removes a blacklisted URL in both |_mostVisitedData|.
+- (void)removeBlacklistedURL:(const GURL&)url;
+
+// Adds URL to the blacklist in both |_mostVisitedData|.
+- (void)addBlacklistedURL:(const GURL&)url;
+
+// Logs a histogram due to a Most Visited item being opened.
+- (void)logMostVisitedClick:(const NSUInteger)visitedIndex
+                   tileType:(ntp_tiles::TileVisualType)tileType;
+
+// Called when a what's new promo is viewed.
+- (void)promoViewed;
+
+// Called when a what's new promo is tapped.
+- (void)promoTapped;
+
+// |YES| if the google landing toolbar can show the forward arrow.
+- (BOOL)canGoForward;

[marq (ping after 24h), 2017/04/20 13:17:14]

Our intent elsewhere has been that dispatched commands can only return void. In
general in the new world we're pushing state into the view layer, not providing
sources it can pull state from.

[justincohen, 2017/04/20 21:28:31]

Removed this file for now, since it will break the 1:M relationship.

+
+// |YES| if the google landing toolbar can show the back arrow.
+- (BOOL)canGoBack;
+
+@end
+
+#endif  // IOS_CHROME_BROWSER_UI_NTP_GOOGLE_LANDING_COMMANDS_H_