Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/framed_browser_window.h

Index: chrome/browser/ui/cocoa/framed_browser_window.h
diff --git a/chrome/browser/ui/cocoa/framed_browser_window.h b/chrome/browser/ui/cocoa/framed_browser_window.h
index ec6da688f6e308387b6e555bae23564dec4bb4c7..8826fffb7d289d7081270876690e55ac07c69fe2 100644
--- a/chrome/browser/ui/cocoa/framed_browser_window.h
+++ b/chrome/browser/ui/cocoa/framed_browser_window.h
@@ -35,6 +35,10 @@ const CGFloat kBrowserFrameViewPaintHeight = 60.0;
   NSButton* miniaturizeButton_;
   NSButton* zoomButton_;
 
+  // Locks the window's frame and style mask. If it's set to YES, then the
+  // frame and the style mask cannot be changed.
+  BOOL frameAndStyleMaskLock_;
+
   CGFloat windowButtonsInterButtonSpacing_;
 }
 
@@ -45,6 +49,20 @@ const CGFloat kBrowserFrameViewPaintHeight = 60.0;
 // Tells the window to suppress title drawing.
 - (void)setShouldHideTitle:(BOOL)flag;
 
+// When the lock is set to YES, the frame and style mask of the Window cannot be
+// changed. This is used to prevent AppKit from making these unwanted changes
+// to the window during exit fullscreen transition. It is very important to
+// release this lock after the transition is completed.
+- (void)setFrameAndStyleMaskLock:(BOOL)lock;
+
+// This method is overridden to prevent AppKit from  setting the style mask
+// when frameAndStyleMaskLock_ is set to true.
+- (void)setStyleMask:(NSUInteger)styleMask;
+
+// This method is overridden to prevent the AppKit from setting the frame when
+// frameAndStyleMaskLock_ is set to true.
+- (void)setFrame:(NSRect)frameRect display:(BOOL)flag animate:(BOOL)animateFlag;

[Andre, 2015/08/13 23:03:19]

nit: flag is not a good parameter name.
I suggest following NSWindow's documentation, which use displayViews and and
performAnimation (or just animate).

[spqchan1, 2015/08/14 01:08:27]

Done.

+
 // Returns the desired spacing between window control views.
 - (CGFloat)windowButtonsInterButtonSpacing;