[PhysicalWeb] Add fake data source and helpers for testing.

components/omnibox/browser/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("//third_party/protobuf/proto_library.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
 
@@ skipping 239 matching lines @@
   deps = [
     ":browser",
     ":test_support",
     ":unit_tests_bundle_data",
     "//base",
     "//components/bookmarks/browser",
     "//components/bookmarks/test",
     "//components/history/core/test",
     "//components/open_from_clipboard:test_support",
     "//components/physical_web/data_source",
+    "//components/physical_web/data_source:test_support",
     "//components/prefs:test_support",
     "//components/search",
     "//components/search_engines",
     "//components/sessions",
     "//components/strings",
     "//components/toolbar:test_support",
     "//components/url_formatter",
     "//components/variations",
     "//net:test_support",
     "//sql",
     "//sql:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//ui/base:base",
     "//url",
   ]
 }