Create //components/ntp_tiles.

Move its prefs and switches in immediately. Later will follow
//chrome/browser/android/ntp/{most_visited_sites,popular_sites}*, as the
work to refactor out their dependencies is ongoing.

BUG=603026

Review-Url: https://codereview.chromium.org/1928913002
Cr-Commit-Position: refs/heads/master@{#390605}
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 91cc214..92157b9 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -149,6 +149,7 @@
     "//components/navigation_metrics",
     "//components/network_time",
     "//components/ntp_snippets",
+    "//components/ntp_tiles",
     "//components/offline_pages",
     "//components/omnibox/browser",
     "//components/os_crypt",