[Mac] Adds a flag to force 10.6-style fullscreen for testing.

chrome/browser/ui/cocoa/panels/display_settings_provider_cocoa.mm

 // Copyright (c) 2012 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/mac/mac_util.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
 #include "chrome/browser/chrome_notification_types.h"
+#include "chrome/browser/fullscreen.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/cocoa/last_active_browser_cocoa.h"
 #include "chrome/browser/ui/panels/display_settings_provider.h"
 #import "chrome/browser/app_controller_mac.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
 #include "ui/base/work_area_watcher_observer.h"
@@ skipping 66 matching lines @@
       removeObserver:active_space_change_];
 }
 
 bool DisplaySettingsProviderCocoa::NeedsPeriodicFullScreenCheck() const {
   // Lion system introduces fullscreen support. When a window of an application
   // enters fullscreen mode, the system will automatically hide all other
   // windows, even including topmost windows that come from other applications.
   // So we don't need to do anything when any other application enters
   // fullscreen mode. We still need to handle the case when chrome enters
   // fullscreen mode and our topmost windows will not get hided by the system.
-  return !base::mac::IsOSLionOrLater();
+  return !chrome::mac::SupportsSystemFullscreen();
 }
 
 bool DisplaySettingsProviderCocoa::IsFullScreen() {
   // For Lion and later, we only need to check if chrome enters fullscreen mode
   // (see detailed reason above in NeedsPeriodicFullScreenCheck).
-  if (!base::mac::IsOSLionOrLater())
+  if (!chrome::mac::SupportsSystemFullscreen())
     return DisplaySettingsProvider::IsFullScreen();
 
   Browser* browser = chrome::GetLastActiveBrowser();
   if (!browser)
     return false;
   BrowserWindow* browser_window = browser->window();
   if (!browser_window->IsFullscreen())
     return false;
 
   // If the user switches to another space where the fullscreen browser window
@@ skipping 30 matching lines @@
                  PERFORM_FULLSCREEN_CHECK),
       base::TimeDelta::FromMilliseconds(kCheckFullScreenDelayTimeMs));
 }
 
 }  // namespace
 
 // static
 DisplaySettingsProvider* DisplaySettingsProvider::Create() {
   return new DisplaySettingsProviderCocoa();
 }