Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/framed_browser_window.mm

Index: chrome/browser/ui/cocoa/framed_browser_window.mm
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.mm b/chrome/browser/ui/cocoa/framed_browser_window.mm
index 5d098be8d3c00a47cd7a24ab4c2703c7ba498748..a83bc148bea819e70db4441d2d2903bccc92de7f 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.mm
+++ b/chrome/browser/ui/cocoa/framed_browser_window.mm
@@ -45,6 +45,20 @@ const CGFloat kWindowGradientHeight = 24.0;
 
 @implementation FramedBrowserWindow
 
+- (void)setStyleMask:(NSUInteger)styleMask {
+  if (frameAndStyleMaskLock_)
+    return;
+  [super setStyleMask:styleMask];
+}
+
+- (void)setFrame:(NSRect)windowFrame
+         display:(BOOL)displayViews
+         animate:(BOOL)performAnimation {
+  if (frameAndStyleMaskLock_)
+    return;
+  [super setFrame:windowFrame display:displayViews animate:performAnimation];
+}
+
 - (id)initWithContentRect:(NSRect)contentRect
               hasTabStrip:(BOOL)hasTabStrip{
   NSUInteger styleMask = NSTitledWindowMask |
@@ -97,6 +111,8 @@ const CGFloat kWindowGradientHeight = 24.0;
                selector:@selector(adjustZoomButton:)
                    name:NSViewFrameDidChangeNotification
                  object:zoomButton_];
+
+    frameAndStyleMaskLock_ = NO;
   }
 
   return self;
@@ -177,6 +193,10 @@ const CGFloat kWindowGradientHeight = 24.0;
   shouldHideTitle_ = flag;
 }
 
+- (void)setFrameAndStyleMaskLock:(BOOL)lock {
+  frameAndStyleMaskLock_ = lock;
+}
+
 - (BOOL)_isTitleHidden {
   return shouldHideTitle_;
 }