Split the NTP in two targets to use it in ContentSuggestions

ios/chrome/browser/ui/ntp/BUILD.gn

 # 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.
 
 bundle_data("resources") {
   sources = [
     "resources/bookmarks_bar_bg.png",
     "resources/bookmarks_bar_bg@2x.png",
     "resources/bookmarks_bar_bg@2x~ipad.png",
     "resources/bookmarks_bar_bg_pressed@2x~ipad.png",
@@ skipping 91 matching lines @@
     "{{bundle_resources_dir}}/{{source_file_part}}",
   ]
 }
 
 source_set("ntp") {
   sources = [
     "new_tab_page_panel_protocol.h",
   ]
 }
 
+source_set("ntp_header") {
+  sources = [
+    "google_landing_data_source.h",
+    "new_tab_page_header_constants.h",
+    "new_tab_page_header_constants.mm",
+    "new_tab_page_header_view.h",
+    "new_tab_page_header_view.mm",
+    "new_tab_page_toolbar_controller.h",
+    "new_tab_page_toolbar_controller.mm",
+  ]
+  deps = [
+    "//base",
+    "//components/ntp_tiles",
+    "//components/strings",
+    "//components/toolbar",
+    "//ios/chrome/app/theme",
+    "//ios/chrome/browser/tabs",
+    "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/ui/commands",
+    "//ios/chrome/browser/ui/toolbar",
+    "//ios/chrome/browser/ui/toolbar:resource_macros",
+    "//ios/chrome/common",
+    "//ui/base",
+  ]
+}
+
 source_set("ntp_internal") {
   sources = [
     "centering_scrollview.h",
     "centering_scrollview.mm",
     "google_landing_consumer.h",
-    "google_landing_data_source.h",
     "google_landing_mediator.h",
     "google_landing_mediator.mm",
     "google_landing_view_controller.h",
     "google_landing_view_controller.mm",
     "incognito_panel_controller.h",
     "incognito_panel_controller.mm",
     "most_visited_cell.h",
     "most_visited_cell.mm",
     "most_visited_layout.h",
     "most_visited_layout.mm",
     "new_tab_page_bar.h",
     "new_tab_page_bar.mm",
     "new_tab_page_bar_button.h",
     "new_tab_page_bar_button.mm",
     "new_tab_page_bar_item.h",
     "new_tab_page_bar_item.mm",
     "new_tab_page_controller.h",
     "new_tab_page_controller.mm",
-    "new_tab_page_header_constants.h",
-    "new_tab_page_header_constants.mm",
-    "new_tab_page_header_view.h",
-    "new_tab_page_header_view.mm",
     "new_tab_page_panel_protocol.mm",
-    "new_tab_page_toolbar_controller.h",
-    "new_tab_page_toolbar_controller.mm",
     "new_tab_page_view.h",
     "new_tab_page_view.mm",
     "notification_promo_whats_new.h",
     "notification_promo_whats_new.mm",
     "whats_new_header_view.h",
     "whats_new_header_view.mm",
   ]
+  public_deps = [
+    ":ntp_header",
+  ]
   deps = [
     ":ntp",
     ":resources",
     "//base",
     "//base:i18n",
     "//components/favicon/core",
     "//components/favicon_base",
     "//components/google/core/browser",
     "//components/history/core/browser",
     "//components/keyed_service/core",
     "//components/metrics",
     "//components/ntp_tiles",
     "//components/prefs",
     "//components/rappor",
     "//components/search_engines",
     "//components/strings",
     "//components/suggestions",
     "//components/sync_sessions",
-    "//components/toolbar",
     "//ios/chrome/app/strings",
-    "//ios/chrome/app/theme",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/favicon",
     "//ios/chrome/browser/history",
     "//ios/chrome/browser/metrics:metrics_internal",
     "//ios/chrome/browser/ntp_tiles",
     "//ios/chrome/browser/reading_list",
     "//ios/chrome/browser/search_engines",
     "//ios/chrome/browser/suggestions",
     "//ios/chrome/browser/sync",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/bookmarks",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/context_menu",
     "//ios/chrome/browser/ui/ntp/recent_tabs",
     "//ios/chrome/browser/ui/overscroll_actions",
     "//ios/chrome/browser/ui/toolbar",
-    "//ios/chrome/browser/ui/toolbar:resource_macros",
     "//ios/chrome/browser/web_state_list",
     "//ios/chrome/common",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/images",
     "//ios/public/provider/chrome/browser/ui",
     "//ios/public/provider/chrome/browser/voice",
     "//ios/shared/chrome/browser/ui/commands",
     "//ios/third_party/material_components_ios",
     "//ios/third_party/material_roboto_font_loader_ios",
     "//ios/web",
@@ skipping 83 matching lines @@
     "new_tab_page_perftest.mm",
   ]
   deps = [
     "//base/test:test_support",
     "//ios/chrome/browser/sessions",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/test:perf_test_support",
     "//ios/chrome/browser/ui:ui_internal",
   ]
 }