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

ui/app_list/cocoa/app_list_view_window_unittest.mm

+// 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/memory/scoped_nsobject.h"
+#import "testing/gtest_mac.h"
+#import "ui/app_list/cocoa/app_list_view_window.h"
+#import "ui/base/test/ui_cocoa_test_helper.h"
+
+// Unit test harness for Cocoa-specific interactions with the app_list.
+class AppListViewWindowTest : public ui::CocoaTest {
+ public:
+  AppListViewWindowTest() {
+    Init();
+    window_.reset([[AppListViewWindow alloc] initAsBubble]);
+  }
+
+ protected:
+  scoped_nsobject<AppListViewWindow> window_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(AppListViewWindowTest);
+};
+
+// Test showing, hiding and closing the AppListViewWindow with no content.
+TEST_F(AppListViewWindowTest, ShowHideCloseRelease) {
+  [window_ makeKeyAndOrderFront:nil];
+  [window_ close];
+  [window_ setReleasedWhenClosed:YES];
+  [window_ close];
+  window_.reset();
+}