Create //components/ntp_tiles.

components/ntp_tiles/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.
 
-source_set("client_update_protocol") {
+# GYP version: components/ntp_tiles.gypi:ntp_tiles
+source_set("ntp_tiles") {
   sources = [
-    "ecdsa.cc",
-    "ecdsa.h",
+    "pref_names.cc",
+    "pref_names.h",
+    "switches.cc",
+    "switches.h",
   ]
 
-  deps = [
+  public_deps = [
     "//base",
-    "//crypto",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
-  sources = [
-    "ecdsa_unittest.cc",
-  ]
+  sources = []
 
   deps = [
-    ":client_update_protocol",
+    ":ntp_tiles",
     "//base",
-    "//crypto",
-    "//testing/gtest",
   ]
 }