Uses child views in Autofill Popup so we can trigger

chrome/browser/ui/cocoa/autofill/autofill_popup_view_cocoa.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/autofill/autofill_popup_view_cocoa.h"
 
 #include "base/logging.h"
 #include "base/mac/mac_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 108 matching lines @@
     if (suggestion.frontend_id == autofill::POPUP_ITEM_ID_SEPARATOR) {
       [self drawSeparatorWithBounds:rowBounds];
       continue;
     }
 
     // Additional offset applied to the text in the vertical direction.
     CGFloat textYOffset = 0;
 
     NSString* value = SysUTF16ToNSString(controller_->GetElidedValueAt(i));
     NSString* label = SysUTF16ToNSString(controller_->GetElidedLabelAt(i));
-    BOOL isSelected = static_cast<int>(i) == controller_->selected_line();
+    BOOL isSelected = controller_->selected_line() &&
+                      i == controller_->selected_line().value();
     [self drawSuggestionWithName:value
                          subtext:label
                            index:i
                           bounds:rowBounds
                         selected:isSelected
                      textYOffset:textYOffset];
   }
 }
 
 #pragma mark -
@@ skipping 164 matching lines @@
   }
 
   int iconId = delegate_->GetIconResourceID(icon);
   DCHECK_NE(-1, iconId);
 
   ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
   return rb.GetNativeImageNamed(iconId).ToNSImage();
 }
 
 @end