Implemented fullscreen exit animation with AppKit

chrome/browser/ui/cocoa/full_size_content_window.h

Index: chrome/browser/ui/cocoa/full_size_content_window.h
diff --git a/chrome/browser/ui/cocoa/full_size_content_window.h b/chrome/browser/ui/cocoa/full_size_content_window.h
index 1c8d44d776b01f47a9f246c0c5f87ca6d41568f8..5af2815a486eebe1e0a224f108a5e6110db4260d 100644
--- a/chrome/browser/ui/cocoa/full_size_content_window.h
+++ b/chrome/browser/ui/cocoa/full_size_content_window.h
@@ -21,6 +21,22 @@
 //
 // This class currently does not support changing the window's style after the
 // window has been initialized.
+
+// 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
+
+// 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;
+
+// This method allows us to set the content view size since setFrameSize is
+// overridden to prevent the view from shrinking
+- (void)forceFrameSize:(NSSize)size;
+
+@end
+
 @interface FullSizeContentWindow : ChromeEventProcessingWindow {
  @private
   // Holds the view that replaces [window contentView]. This view has the same