Skeleton for app_list on OSX, and refactoring for enable_app_list=1 on OS=="mac".

chrome/browser/ui/cocoa/app_list/app_list_controller_cocoa.mm

Index: chrome/browser/ui/cocoa/app_list/app_list_controller_cocoa.mm
diff --git a/chrome/browser/ui/cocoa/app_list/app_list_controller_cocoa.mm b/chrome/browser/ui/cocoa/app_list/app_list_controller_cocoa.mm
new file mode 100644
index 0000000000000000000000000000000000000000..dca65898f8189326bbb780028ef44f6a01ce1d2f
--- /dev/null
+++ b/chrome/browser/ui/cocoa/app_list/app_list_controller_cocoa.mm
@@ -0,0 +1,74 @@
+// 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 "base/bind.h"
+#include "base/lazy_instance.h"
+#include "base/memory/scoped_nsobject.h"
+#include "base/message_loop.h"
+#include "base/time.h"
+#include "base/timer.h"
+#include "chrome/browser/ui/app_list/app_list_util.h"
+#include "ui/app_list/cocoa/app_list_view_window.h"
+
+namespace {
+
+// The AppListController class manages global resources needed for the app
+// list to operate, and controls when the app list is opened and closed.
+class AppListController {
+ public:
+  AppListController() {}
+  ~AppListController() {}
+
+  void CreateAppList();
+  void ShowAppList();
+  void DismissAppList();
+ private:
+  scoped_nsobject<AppListViewWindow> current_window_;
+  base::OneShotTimer<AppListController> timer_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppListController);
+};
+
+base::LazyInstance<AppListController>::Leaky g_app_list_controller =
+    LAZY_INSTANCE_INITIALIZER;
+
+void AppListController::CreateAppList() {
+  current_window_.reset([[AppListViewWindow alloc] initAsBubble]);
+}
+
+void AppListController::ShowAppList() {
+  const int kLifetimeIntervalMS = 1000;
+
+  if (!current_window_)
+    CreateAppList();
+
+  timer_.Start(FROM_HERE,
+               base::TimeDelta::FromMilliseconds(kLifetimeIntervalMS), this,
+               &AppListController::DismissAppList);
+  [current_window_ makeKeyAndOrderFront:nil];
+}
+
+void AppListController::DismissAppList() {
+  if (!current_window_)
+    return;
+
+  timer_.Stop();
+  [current_window_ close];
+}
+
+}  // namespace
+
+
+namespace chrome {
+
+void InitAppList() {
+  // TODO(tapted): AppList warmup code coes here.
+}
+
+void ShowAppList() {
+  // Create the App list.
+  g_app_list_controller.Get().ShowAppList();
+}
+
+}  // namespace chrome