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

chrome/browser/ui/gtk/location_bar_view_gtk.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/location_bar_view_gtk.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 819 matching lines @@
                                 l10n_util::GetStringUTF8(tooltip_id).c_str());
   }
 
   g_signal_connect(result, "button-press-event",
                      G_CALLBACK(click_callback), this);
 
   return result;
 }
 
 void LocationBarViewGtk::CreateZoomButton() {
-  // TODO(khorimoto): Add tests for zoom button.
   zoom_.Own(CreateIconButton(&zoom_image_,
                              0,
-                             VIEW_ID_NONE,
+                             VIEW_ID_ZOOM_BUTTON,
                              0,
                              OnZoomButtonPressThunk));
 }
 
 void LocationBarViewGtk::CreateStarButton() {
   star_.Own(CreateIconButton(&star_image_,
                              0,
                              VIEW_ID_STAR_BUTTON,
                              IDS_TOOLTIP_STAR,
                              OnStarButtonPressThunk));
@@ skipping 1284 matching lines @@
 }
 
 void LocationBarViewGtk::PageActionViewGtk::InspectPopup(
     ExtensionAction* action) {
   ExtensionPopupGtk::Show(
       action->GetPopupUrl(current_tab_id_),
       owner_->browser_,
       event_box_.get(),
       ExtensionPopupGtk::SHOW_AND_INSPECT);
 }