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

ios/clean/chrome/browser/ui/ntp/ntp_home_coordinator.mm

+// 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.
+
+#import "ios/clean/chrome/browser/ui/ntp/ntp_home_coordinator.h"
+
+#import "ios/chrome/browser/ui/ntp/google_landing_controller.h"
+#import "ios/clean/chrome/browser/ui/ntp/ntp_home_mediator.h"
+#import "ios/shared/chrome/browser/coordinator_context/coordinator_context.h"
+#import "ios/shared/chrome/browser/ui/browser_list/browser.h"
+#import "ios/shared/chrome/browser/ui/coordinators/browser_coordinator+internal.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface NTPHomeCoordinator ()
+@property(nonatomic, strong) NTPHomeMediator* mediator;
+@property(nonatomic, strong) UIViewController* viewController;
+@property(nonatomic, strong) GoogleLandingController* wrapperController;
+@end
+
+@implementation NTPHomeCoordinator
+@synthesize mediator = _mediator;
+@synthesize viewController = _viewController;
+@synthesize wrapperController = _wrapperController;
+
+- (void)start {
+  // PLACEHOLDER: Re-using old view controllers for now.
+  self.mediator = [[NTPHomeMediator alloc] init];
+  self.mediator.dispatcher = static_cast<id>(self.browser->dispatcher());
+  self.wrapperController = [[GoogleLandingController alloc]
+          initWithLoader:self.mediator
+            browserState:self.browser->browser_state()
+                 focuser:self.mediator
+      webToolbarDelegate:nil
+                tabModel:nil];
+  self.viewController = [[UIViewController alloc] init];
+  self.viewController.view = [self.wrapperController view];
+  [super start];
+}
+
+@end