Fix Hiding Issue with Certificate Viewer Mac

chrome/browser/ui/cocoa/certificate_viewer_mac.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/certificate_viewer_mac.h"
 
 #include <Security/Security.h>
 #include <SecurityInterface/SFCertificatePanel.h>
 #include <vector>
 
@@ skipping 150 matching lines @@
   // method.
   [panel_ _dismissWithCode:NSFileHandlingPanelCancelButton];
 }
 
 - (void)hideSheet {
   NSWindow* sheetWindow = [overlayWindow_ attachedSheet];
   [sheetWindow setAlphaValue:0.0];
 
   oldResizesSubviews_ = [[sheetWindow contentView] autoresizesSubviews];
   [[sheetWindow contentView] setAutoresizesSubviews:NO];
+
+  oldSheetFrame_ = [sheetWindow frame];
+  NSRect overlayFrame = [overlayWindow_ frame];
+  oldSheetFrame_.origin.x -= NSMinX(overlayFrame);
+  oldSheetFrame_.origin.y -= NSMinY(overlayFrame);
+  oldOverlaySize_ = [overlayWindow_ frame].size;
+  [sheetWindow setFrame:ui::kWindowSizeDeterminedLater display:NO];
 }
 
 - (void)unhideSheet {
   NSWindow* sheetWindow = [overlayWindow_ attachedSheet];
+  NSRect overlayFrame = [overlayWindow_ frame];
+
+  // If the overlay frame's size has changed, the position offsets need to be
+  // calculated. Since the certificate is horizontally centered, so the x
+  // offset is calculated by halving the width difference. In addition,
+  // because the certificate is located directly below the toolbar, the y
+  // offset is just the difference in height.
+  CGFloat yOffset = (NSHeight(overlayFrame) - oldOverlaySize_.height);
+  CGFloat xOffset = (NSWidth(overlayFrame) - oldOverlaySize_.width) / 2;
+
+  oldSheetFrame_.origin.x += NSMinX(overlayFrame) + xOffset;
+  oldSheetFrame_.origin.y += NSMinY(overlayFrame) + yOffset;
+  [sheetWindow setFrame:oldSheetFrame_ display:NO];
 
   [[sheetWindow contentView] setAutoresizesSubviews:oldResizesSubviews_];
   [[overlayWindow_ attachedSheet] setAlphaValue:1.0];
 }
 
 - (void)pulseSheet {
   // NOOP
 }
 
 - (void)makeSheetKeyAndOrderFront {
@@ skipping 12 matching lines @@
   return panel_;
 }
 
 - (void)onConstrainedWindowClosed {
   panel_.reset();
   constrainedWindow_.reset();
   [self release];
 }
 
 @end