mac: Add basic layout unit test for fullscreen transition.

chrome/browser/ui/cocoa/presentation_mode_controller.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_PRESENTATION_MODE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_PRESENTATION_MODE_CONTROLLER_H_
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
@@ skipping 123 matching lines @@
 - (void)ensureOverlayHiddenWithAnimation:(BOOL)animate delay:(BOOL)delay;
 
 // Cancels any running animation and timers.
 - (void)cancelAnimationAndTimers;
 
 // In any fullscreen mode, the y offset to use for the content at the top of
 // the screen (tab strip, omnibox, bookmark bar, etc).
 // Ranges from 0 to -22.
 - (CGFloat)menubarOffset;
 
+// Exposed for testing.
+// Adjusts the fullscreen state of the application.
+- (void)setSystemFullscreenModeTo:(base::mac::FullScreenMode)mode;
+
+// Exposed for testing.
+// Callback for menu bar animations.
+- (void)setMenuBarRevealProgress:(CGFloat)progress;

[Andre, 2014/09/05 00:13:00]

Why are these 2 exposed here, but changeToolbarFraction is not (the test makes a
category for it).
How about  we move them to a category declared in
presentation_mode_controller_private.h which the test can include?

[erikchen, 2014/09/05 17:57:49]

Done.

+
 @end
 
 // Notification posted when we're about to enter or leave fullscreen.
 extern NSString* const kWillEnterFullscreenNotification;
 extern NSString* const kWillLeaveFullscreenNotification;
 
 #endif  // CHROME_BROWSER_UI_COCOA_PRESENTATION_MODE_CONTROLLER_H_