Adds a mock for component_updater::ComponentUpdateService

components/component_updater/mock_component_updater_service.cc

Index: components/component_updater/mock_component_updater_service.cc
diff --git a/components/component_updater/mock_component_updater_service.cc b/components/component_updater/mock_component_updater_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9cadb37d88d39827b775929a73dab9352b48656b
--- /dev/null
+++ b/components/component_updater/mock_component_updater_service.cc
@@ -0,0 +1,13 @@
+// Copyright 2015 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.
+
+#include "components/component_updater/mock_component_updater_service.h"
+
+namespace component_updater {
+
+MockComponentUpdateService::MockComponentUpdateService() {}
+
+MockComponentUpdateService::~MockComponentUpdateService() {}
+
+}  // namespace component_updater