Only show Last N Pages in the UI when the corresponding tab is visible.

components/ntp_snippets/BUILD.gn

 # Copyright 2014 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("//build/config/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 85 matching lines @@
   ]
 
   deps = [
     "//components/bookmarks/browser",
     "//components/data_use_measurement/core",
     "//components/history/core/browser",
     "//components/image_fetcher",
     "//components/metrics",
     "//components/ntp_snippets/remote/proto",
     "//components/offline_pages/core",
+    "//components/offline_pages/core/downloads:offline_pages_ui_adapter",
+    "//components/offline_pages/core/recent_tabs",
     "//components/physical_web/data_source",
     "//components/sessions",
     "//components/strings",
     "//components/sync_sessions",
     "//components/translate/core/browser",
     "//components/variations",
     "//components/variations/net",
     "//third_party/icu/",
     "//ui/gfx",
   ]
@@ skipping 40 matching lines @@
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//components/bookmarks/browser",
     "//components/bookmarks/test",
     "//components/image_fetcher",
     "//components/leveldb_proto:test_support",
     "//components/ntp_snippets/remote/proto",
     "//components/offline_pages/core",
     "//components/offline_pages/core:test_support",
+    "//components/offline_pages/core/background:test_support",
+    "//components/offline_pages/core/downloads:offline_pages_ui_adapter",
+    "//components/offline_pages/core/recent_tabs",
     "//components/physical_web/data_source:test_support",
     "//components/sessions",
     "//components/sessions:test_support",
     "//components/signin/core/browser:test_support",
     "//components/signin/core/common",
     "//components/strings",
     "//components/sync:test_support_driver",
     "//components/sync_sessions",
     "//components/variations:test_support",
     "//net:test_support",
@@ skipping 22 matching lines @@
 
   deps = [
     ":ntp_snippets",
     "//base",
     "//components/offline_pages/core",
     "//components/offline_pages/core:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }