[Extensions UI Mac] Use frameAfterAnimation for extension action button opacity

chrome/browser/ui/cocoa/extensions/browser_actions_controller.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/extensions/browser_actions_controller.h"
 
 #include <string>
 
 #include "base/strings/sys_string_conversions.h"
 #include "chrome/browser/extensions/extension_message_bubble_controller.h"
@@ skipping 650 matching lines @@
 
 - (BOOL)updateContainerVisibility {
   BOOL hidden = [buttons_ count] == 0;
   if ([containerView_ isHidden] != hidden)
     [containerView_ setHidden:hidden];
   return !hidden;
 }
 
 - (void)updateButtonOpacity {
   for (BrowserActionButton* button in buttons_.get()) {
-    NSRect buttonFrame = [button frame];
+    NSRect buttonFrame = [button frameAfterAnimation];
     if (NSContainsRect([containerView_ bounds], buttonFrame)) {
       if ([button alphaValue] != 1.0)
         [button setAlphaValue:1.0];
 
       continue;
     }
     CGFloat intersectionWidth =
         NSWidth(NSIntersectionRect([containerView_ bounds], buttonFrame));
     CGFloat alpha = std::max(static_cast<CGFloat>(0.0),
                              intersectionWidth / NSWidth(buttonFrame));
@@ skipping 353 matching lines @@
 }
 
 #pragma mark -
 #pragma mark Testing Methods
 
 - (BrowserActionButton*)buttonWithIndex:(NSUInteger)index {
   return index < [buttons_ count] ? [buttons_ objectAtIndex:index] : nil;
 }
 
 @end