[Mac] Use private, undocumented Carbon events to make the presentation mode animation better.

chrome/browser/ui/cocoa/presentation_mode_controller.h

 // Copyright (c) 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_PRESENTATION_MODE_CONTROLLER_H_
 #define CHROME_BROWSER_UI_COCOA_PRESENTATION_MODE_CONTROLLER_H_
 
+#include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/mac/mac_util.h"
 #include "chrome/browser/ui/cocoa/location_bar/location_bar_view_mac.h"
 
 @class BrowserWindowController;
 @class DropdownAnimation;
 
 // Provides a controller to manage presentation mode for a single browser
 // window.  This class handles running animations, showing and hiding the
@@ skipping 26 matching lines @@
   // area is attached to |contentView_|, because when the dropdown is completely
   // hidden, we still need to keep a 1px tall tracking area visible.  Attaching
   // to the content view allows us to do this.  |trackingArea_| can be nil if
   // not in presentation mode or during animations.
   scoped_nsobject<NSTrackingArea> trackingArea_;
 
   // Pointer to the currently running animation.  Is nil if no animation is
   // running.
   scoped_nsobject<DropdownAnimation> currentAnimation_;
 
+  // Carbon event handler that's used on 10.7+ to track the menu bar as it's
+  // animating in and out. Used instead of currentAnimation_.
+  EventHandlerRef menuBarTrackingHandler_;
+
   // Timers for scheduled showing/hiding of the bar (which are always done with
   // animation).
   scoped_nsobject<NSTimer> showTimer_;
   scoped_nsobject<NSTimer> hideTimer_;
 
   // Holds the current bounds of |trackingArea_|, even if |trackingArea_| is
   // currently nil.  Used to restore the tracking area when an animation
   // completes.
   NSRect trackingAreaBounds_;
 
@@ skipping 50 matching lines @@
 // effects, such as modifying the system fullscreen mode (menu bar shown state).
 - (void)changeFloatingBarShownFraction:(CGFloat)fraction;
 
 @end
 
 // Notification posted when we're about to enter or leave fullscreen.
 extern NSString* const kWillEnterFullscreenNotification;
 extern NSString* const kWillLeaveFullscreenNotification;
 
 #endif  // CHROME_BROWSER_UI_COCOA_PRESENTATION_MODE_CONTROLLER_H_