Add NTPViewController to Showcase.

ios/showcase/ntp/sc_ntp_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/showcase/ntp/sc_ntp_coordinator.h"
+
+#import "ios/chrome/browser/ui/ntp/new_tab_page_bar_item.h"
+#import "ios/clean/chrome/browser/ui/commands/ntp_commands.h"
+#import "ios/clean/chrome/browser/ui/ntp/ntp_view_controller.h"
+#import "ios/showcase/common/protocol_alerter.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface SCNTPCoordinator ()
+@property(nonatomic, strong) ProtocolAlerter* alerter;
+@end
+
+@implementation SCNTPCoordinator
+
+@synthesize baseViewController;
+@synthesize alerter = _alerter;
+
+- (void)start {
+  NTPViewController* ntp = [[NTPViewController alloc] init];
+
+  self.alerter =
+      [[ProtocolAlerter alloc] initWithProtocols:@[ @protocol(NTPCommands) ]];
+  self.alerter.baseViewController = self.baseViewController;
+  ntp.dispatcher = static_cast<id<NTPCommands>>(self.alerter);
+
+  NewTabPageBarItem* item1 = [NewTabPageBarItem
+      newTabPageBarItemWithTitle:@"Item 1"
+                      identifier:0
+                           image:[UIImage imageNamed:@"ntp_mv_search"]];
+  NewTabPageBarItem* item2 = [NewTabPageBarItem
+      newTabPageBarItemWithTitle:@"Item 2"
+                      identifier:0
+                           image:[UIImage imageNamed:@"ntp_bookmarks"]];
+  [ntp setBarItems:@[ item1, item2 ]];
+
+  [self.baseViewController pushViewController:ntp animated:YES];
+}
+
+@end