Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/browser_window_controller.mm

 // Copyright 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/browser_window_controller.h"
 
 #include <cmath>
 #include <numeric>
 
 #include "base/command_line.h"
@@ skipping 2133 matching lines @@
 
 - (BOOL)isInAnyFullscreenMode {
   return [self isInImmersiveFullscreen] || [self isInAppKitFullscreen];
 }
 
 - (BOOL)isInImmersiveFullscreen {
   return fullscreenWindow_.get() != nil || enteringImmersiveFullscreen_;
 }
 
 - (BOOL)isInAppKitFullscreen {
-  return ([[self window] styleMask] & NSFullScreenWindowMask) ==
-             NSFullScreenWindowMask ||
-         enteringAppKitFullscreen_;
+  return !exitingAppKitFullscreen_ &&
+         (([[self window] styleMask] & NSFullScreenWindowMask) ==
+              NSFullScreenWindowMask ||
+          enteringAppKitFullscreen_);
 }
 
 - (void)enterExtensionFullscreenForURL:(const GURL&)url
                             bubbleType:(ExclusiveAccessBubbleType)bubbleType {
   if (chrome::mac::SupportsSystemFullscreen()) {
     fullscreenUrl_ = url;
     exclusiveAccessBubbleType_ = bubbleType;
     [self enterBrowserFullscreenWithToolbar:NO];
   } else {
     [self enterImmersiveFullscreen];
@@ skipping 99 matching lines @@
 
 - (BOOL)supportsBookmarkBar {
   return [self supportsWindowFeature:Browser::FEATURE_BOOKMARKBAR];
 }
 
 - (BOOL)isTabbedWindow {
   return browser_->is_type_tabbed();
 }
 
 @end  // @implementation BrowserWindowController(WindowType)