mac: Add basic layout unit test for fullscreen transition.

chrome/browser/ui/cocoa/browser_window_controller_private.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_PRIVATE_H_
 #define CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_PRIVATE_H_
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/presentation_mode_controller.h"
 
@@ skipping 141 matching lines @@
 // Allows the omnibox to slide. Also prepares UI for several fullscreen modes.
 // This method gets called when entering AppKit fullscren, or when entering
 // Immersive fullscreen. Expects fullscreenStyle_ to be set.
 - (void)adjustUIForSlidingFullscreenStyle:(fullscreen_mac::SlidingStyle)style;
 
 // This method gets called when exiting AppKit fullscreen, or when exiting
 // Immersive fullscreen. It performs some common UI changes, and stops the
 // omnibox from sliding.
 - (void)adjustUIForExitingFullscreenAndStopOmniboxSliding;
 
+// Exposed for testing.
+// Creates a PresentationModeController with the given style.
+- (PresentationModeController*)newPresentationModeControllerWithStyle:
+    (fullscreen_mac::SlidingStyle)style;
+
 // Toggles the AppKit Fullscreen API. By default, doing so enters Canonical
 // Fullscreen.
 - (void)enterAppKitFullscreen;
 - (void)exitAppKitFullscreen;
 
 @end  // @interface BrowserWindowController(Private)
 
 #endif  // CHROME_BROWSER_UI_COCOA_BROWSER_WINDOW_CONTROLLER_PRIVATE_H_