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

chrome/browser/ui/views/location_bar/location_bar_view.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/views/location_bar/location_bar_view.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/command_line.h"
@@ skipping 291 matching lines @@
                                     kCSBubbleBackgroundImages, this,
                                     font_,
                                     GetColor(instant_extended_api_enabled_,
                                              ToolbarModel::NONE, TEXT));
     content_setting_views_.push_back(content_blocked_view);
     AddChildView(content_blocked_view);
     content_blocked_view->SetVisible(false);
   }
 
   zoom_view_ = new ZoomView(model_, delegate_);
+  zoom_view_->set_id(VIEW_ID_ZOOM_BUTTON);
   AddChildView(zoom_view_);
 
   web_intents_button_view_ =
       new WebIntentsButtonView(this, kWIBubbleBackgroundImages, font_,
                                GetColor(instant_extended_api_enabled_,
                                         ToolbarModel::NONE, TEXT));
   AddChildView(web_intents_button_view_);
 
   open_pdf_in_reader_view_ = new OpenPDFInReaderView(this);
   AddChildView(open_pdf_in_reader_view_);
@@ skipping 1354 matching lines @@
 }
 
 void LocationBarView::CleanupFadeAnimation() {
   // Since we're no longer animating we don't need our layer.
   SetPaintToLayer(false);
   // Bubble labels don't need a transparent background anymore.
   ev_bubble_view_->SetLabelBackgroundColor(SK_ColorWHITE);
   selected_keyword_view_->SetLabelBackgroundColor(SK_ColorWHITE);
 }
 #endif  // USE_AURA