Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/full_size_content_window.mm

 // Copyright 2014 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/full_size_content_window.h"
 
 #include "base/logging.h"
 
 @interface FullSizeContentWindow ()
 
 + (BOOL)shouldUseFullSizeContentViewForStyle:(NSUInteger)windowStyle;
 
 @end
 
 // This view always takes the size of its superview. It is intended to be used
 // as a NSWindow's contentView.  It is needed because NSWindow's implementation
 // explicitly resizes the contentView at inopportune times.
-@interface FullSizeContentView : NSView
-@end
 
 @implementation FullSizeContentView
 
 // This method is directly called by AppKit during a live window resize.
 // Override it to prevent the content view from shrinking.
 - (void)setFrameSize:(NSSize)size {
   if ([self superview])
     size = [[self superview] bounds].size;
   [super setFrameSize:size];
 }
 
+- (void)forceFrameSize:(NSSize)size {
+  [super setFrameSize:size];
+}
+
 @end
 
 @implementation FullSizeContentWindow
 
 #pragma mark - Lifecycle
 
 - (instancetype)init {
   NOTREACHED();
   return nil;
 }
@@ skipping 66 matching lines @@
   return [super contentRectForFrameRect:fRect styleMask:aStyle];
 }
 
 - (NSRect)contentRectForFrameRect:(NSRect)frameRect {
   if (chromeWindowView_)
     return frameRect;
   return [super contentRectForFrameRect:frameRect];
 }
 
 @end