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

chrome/browser/ui/cocoa/presentation_mode_controller.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.
 
 #import "chrome/browser/ui/cocoa/presentation_mode_controller.h"
 
 #include <algorithm>
 
 #include "base/command_line.h"
 #import "base/mac/mac_util.h"
+#include "chrome/browser/fullscreen.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #include "chrome/common/chrome_switches.h"
 #import "third_party/GTM/AppKit/GTMNSAnimation+Duration.h"
 
 NSString* const kWillEnterFullscreenNotification =
     @"WillEnterFullscreenNotification";
 NSString* const kWillLeaveFullscreenNotification =
     @"WillLeaveFullscreenNotification";
 
 namespace {
@@ skipping 393 matching lines @@
 
 @implementation PresentationModeController (PrivateMethods)
 
 - (BOOL)isWindowOnPrimaryScreen {
   NSScreen* screen = [[browserController_ window] screen];
   NSScreen* primaryScreen = [[NSScreen screens] objectAtIndex:0];
   return (screen == primaryScreen);
 }
 
 - (BOOL)shouldToggleMenuBar {
-  return base::mac::IsOSSnowLeopard() &&
+  return !chrome::mac::SupportsSystemFullscreen() &&
          [self isWindowOnPrimaryScreen] &&
          [[browserController_ window] isMainWindow];
 }
 
 - (base::mac::FullScreenMode)desiredSystemFullscreenMode {
   if ([browserController_ floatingBarShownFraction] >= 1.0)
     return base::mac::kFullScreenModeHideDock;
   return base::mac::kFullScreenModeHideAll;
 }
 
@@ skipping 210 matching lines @@
 - (void)hideActiveWindowUI {
   if (systemFullscreenMode_ != base::mac::kFullScreenModeNormal) {
     base::mac::ReleaseFullScreen(systemFullscreenMode_);
     systemFullscreenMode_ = base::mac::kFullScreenModeNormal;
   }
 
   // TODO(rohitrao): Remove the Exit Fullscreen button.  http://crbug.com/35956
 }
 
 @end