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

chrome/browser/ui/gtk/view_id_util.cc

 // 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/gtk/view_id_util.h"
 
 #include <stdint.h>
 #include <string>
 
 #include <gtk/gtk.h>
@@ skipping 92 matching lines @@
 
     case VIEW_ID_FIND_IN_PAGE_TEXT_FIELD:
       return "chrome-find-in-page-entry";
 
     case VIEW_ID_FIND_IN_PAGE:
       return "chrome-find-in-page";
 
     case VIEW_ID_DEV_TOOLS_DOCKED:
       return "chrome-dev-tools-docked";
 
+    case VIEW_ID_ZOOM_BUTTON:
+      return "chrome-zoom-button";
+
     // These are never hit because the tab container uses the delegate to
     // set its ID.
     case VIEW_ID_TAB_CONTAINER:
     default:
       NOTREACHED() << "If you added a new VIEW_ID, please provide "
                       "a name for the widget.";
       return NULL;
   }
 }
 
 }  // namespace
 
 void ViewIDUtil::SetID(GtkWidget* widget, ViewID id) {
   const char* name = GetNameFromID(id);
   if (name)
     gtk_widget_set_name(widget, name);
   g_object_set_data(G_OBJECT(widget), kViewIDString,
                     reinterpret_cast<void*>(id));
 }
 
 GtkWidget* ViewIDUtil::GetWidget(GtkWidget* root, ViewID id) {
   ViewIDSearchStruct search_struct = { id, NULL };
   SearchForWidgetWithViewID(root, &search_struct);
   return search_struct.widget;
 }
 
 void ViewIDUtil::SetDelegateForWidget(GtkWidget* widget, Delegate* delegate) {
   g_object_set_data(G_OBJECT(widget), kViewIDOverrideString, delegate);
 }