Shows chrome-extension urls and greys out the whole url.

chrome/browser/ui/cocoa/omnibox/omnibox_view_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.
 
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_view_mac.h"
 
 #include <Carbon/Carbon.h>  // kVK_Return
 
 #include "base/mac/foundation_util.h"
 #include "base/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/ui/cocoa/event_utils.h"
 #include "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.h"
 #import "chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_editor.h"
 #include "chrome/browser/ui/cocoa/omnibox/omnibox_popup_view_mac.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "content/public/browser/web_contents.h"
+#include "extensions/common/constants.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
 #import "third_party/mozilla/NSPasteboard+Utils.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/gfx/rect.h"
 
 using content::WebContents;
 
 // Focus-handling between |field_| and model() is a bit subtle.
@@ skipping 405 matching lines @@
   scoped_nsobject<NSMutableParagraphStyle>
       paragraph_style([[NSMutableParagraphStyle alloc] init]);
   [paragraph_style setMaximumLineHeight:line_height_];
   [paragraph_style setMinimumLineHeight:line_height_];
   [as addAttribute:NSParagraphStyleAttributeName value:paragraph_style
              range:as_entire_string];
 
   url_parse::Component scheme, host;
   AutocompleteInput::ParseForEmphasizeComponents(
       display_text, &scheme, &host);
-  const bool emphasize = model()->CurrentTextIsURL() && (host.len > 0);
-  if (emphasize) {
+  bool grey_out_url = display_text.substr(scheme.begin, scheme.len) ==
+      UTF8ToUTF16(extensions::kExtensionScheme);
+  if (model()->CurrentTextIsURL() &&
+      (host.is_nonempty() || grey_out_url)) {
     [as addAttribute:NSForegroundColorAttributeName value:BaseTextColor()
                range:as_entire_string];
 
-    [as addAttribute:NSForegroundColorAttributeName value:HostTextColor()
+    if (!grey_out_url) {
+      [as addAttribute:NSForegroundColorAttributeName value:HostTextColor()
                range:ComponentToNSRange(host)];
+    }
   }
 
   // TODO(shess): GTK has this as a member var, figure out why.
   // [Could it be to not change if no change?  If so, I'm guessing
   // AppKit may already handle that.]
   const ToolbarModel::SecurityLevel security_level =
       toolbar_model()->GetSecurityLevel();
 
   // Emphasize the scheme for security UI display purposes (if necessary).
   if (!model()->user_input_in_progress() && model()->CurrentTextIsURL() &&
@@ skipping 500 matching lines @@
 
 NSUInteger OmniboxViewMac::GetTextLength() const {
   return [field_ currentEditor] ?  [[[field_ currentEditor] string] length] :
                                    [[field_ stringValue] length];
 }
 
 bool OmniboxViewMac::IsCaretAtEnd() const {
   const NSRange selection = GetSelectedRange();
   return NSMaxRange(selection) == GetTextLength();
 }