Adds a mock for component_updater::ComponentUpdateService

components/component_updater/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.
 
 source_set("component_updater") {
   sources = [
     "component_updater_paths.cc",
     "component_updater_paths.h",
     "component_updater_service.cc",
     "component_updater_service.h",
@@ skipping 14 matching lines @@
 
   deps = [
     "//base",
     "//components/update_client",
     "//components/version_info",
     "//ui/base",
     "//url",
   ]
 }
 
+source_set("test_support") {
+  testonly = true
+  sources = [
+    "mock_component_updater_service.cc",
+    "mock_component_updater_service.h",
+  ]
+
+  public_deps = [
+    ":component_updater",
+    "//testing/gmock",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
   sources = [
     "component_updater_service_unittest.cc",
     "timer_unittest.cc",
   ]
 
   deps = [
     ":component_updater",
     "//base",
     "//base/test:test_support",
     "//components/update_client:test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }