[test fixlet] Add tests for the zoom icon in the location bar on GTK.

chrome/browser/ui/view_ids.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.
 
 // This defines an enumeration of IDs that can uniquely identify a view within
 // the scope of a container view.
 
 #ifndef CHROME_BROWSER_UI_VIEW_IDS_H_
 #define CHROME_BROWSER_UI_VIEW_IDS_H_
 
@@ skipping 53 matching lines @@
 
   // The contents split.
   VIEW_ID_CONTENTS_SPLIT,
 
   // The Infobar container.
   VIEW_ID_INFO_BAR_CONTAINER,
 
   // The Download shelf.
   VIEW_ID_DOWNLOAD_SHELF,
 
+// TODO(dbeam): change the zoom decoration to an NSImageView on Mac so IDs work.
+#if !defined(OS_MACOSX)
+  // Zoom button in location bar.
+  VIEW_ID_ZOOM_BUTTON,
+#endif
+
   // Used in chrome/browser/ui/gtk/view_id_util_browsertests.cc
   // If you add new ids, make sure the above test passes.
   VIEW_ID_PREDEFINED_COUNT,
 
   // Plus button on location bar.
   VIEW_ID_ACTION_BOX_BUTTON
 };
 
 #endif  // CHROME_BROWSER_UI_VIEW_IDS_H_