Add NTPViewController to Showcase.

ios/showcase/ntp/sc_ntp_coordinator.mm

Index: ios/showcase/ntp/sc_ntp_coordinator.mm
diff --git a/ios/showcase/ntp/sc_ntp_coordinator.mm b/ios/showcase/ntp/sc_ntp_coordinator.mm
new file mode 100644
index 0000000000000000000000000000000000000000..b6d8ad5b5041618019f906d72730fd8a75e15c50
--- /dev/null
+++ b/ios/showcase/ntp/sc_ntp_coordinator.mm
@@ -0,0 +1,22 @@
+// 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/clean/chrome/browser/ui/ntp/new_tab_page_view_controller.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@implementation SCNTPCoordinator
+
+@synthesize baseViewController;
+
+- (void)start {
+  UIViewController* ntp = [[NTPViewController alloc] init];

[lpromero, 2017/02/24 10:19:00]

This is where you setup ntp with whatever you want (mock data, etc.). Since
NTPViewController is more a container than a content view controller, there
might not be a lot? Maybe a fake google_landing_controller? Like a wireframe
controller that only shows a crossed box:
http://www.experienceux.co.uk/wp-content/uploads/2015/06/wireframe_example_la...

+  [self.baseViewController pushViewController:ntp animated:YES];
+}
+
+@end