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

ios/clean/chrome/browser/ui/recent_tabs/BUILD.gn

 # 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.
 
-source_set("ntp") {
+source_set("recent_tabs") {
   sources = [
-    "new_tab_page_coordinator.h",
-    "new_tab_page_coordinator.mm",
+    "recent_tabs_coordinator.h",
+    "recent_tabs_coordinator.mm",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]
 
   deps = [
-    ":ntp_ui",
+    "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/ui/ntp/recent_tabs",
     "//ios/shared/chrome/browser/coordinator_context",
+    "//ios/shared/chrome/browser/ui/browser_list",
     "//ios/shared/chrome/browser/ui/coordinators",
   ]
 }
 
-source_set("ntp_ui") {
+source_set("unit_tests") {
+  testonly = true
   sources = [
-    "new_tab_page_view_controller.h",
-    "new_tab_page_view_controller.mm",
+    "recent_tabs_coordinator_unittest.mm",
   ]
 
+  deps = [
+    ":recent_tabs",
+    "//testing/gtest",
+  ]
   configs += [ "//build/config/compiler:enable_arc" ]
-
-  deps = [
-    "//base",
-    "//components/strings:components_strings_grit",
-    "//ios/chrome/app/strings:ios_strings_grit",
-    "//ios/chrome/browser/ui/ntp:ntp_internal",
-    "//ios/clean/chrome/browser/ui",
-    "//ui/base:base",
-  ]
 }