Add unit tests for AppListServiceImpl.

chrome/browser/ui/app_list/keep_alive_service_impl.cc

+// Copyright 2013 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 "chrome/browser/ui/app_list/keep_alive_service_impl.h"
+
+#include "chrome/browser/lifetime/application_lifetime.h"
+
+ScopedKeepAlive::ScopedKeepAlive() {
+  chrome::StartKeepAlive();
+}
+
+ScopedKeepAlive::~ScopedKeepAlive() {
+  chrome::EndKeepAlive();
+}
+
+KeepAliveServiceImpl::KeepAliveServiceImpl() {
+}
+
+KeepAliveServiceImpl::~KeepAliveServiceImpl() {
+}
+
+void KeepAliveServiceImpl::EnsureKeepAlive() {
+  if (!keep_alive_)
+    keep_alive_.reset(new ScopedKeepAlive());
+}
+
+void KeepAliveServiceImpl::FreeKeepAlive() {
+  if (keep_alive_)
+    keep_alive_.reset();
+}