Discovery API supports specifying a tile in a URL.

chrome/browser/ui/webui/ntp/suggestions_source_discovery.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/webui/ntp/suggestions_source_discovery.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 58 matching lines @@
   const SuggestedLinkList* list = registry->GetAll(extension_id_);
 
   items_.clear();
   for (SuggestedLinkList::const_iterator it = list->begin();
        it != list->end(); ++it) {
     DictionaryValue* page_value = new DictionaryValue();
     NewTabUI::SetURLTitleAndDirection(page_value,
                                       ASCIIToUTF16((*it)->link_text()),
                                       GURL((*it)->link_url()));
     page_value->SetDouble("score", (*it)->score());
+    const std::string& url_image = (*it)->url_image();
+    if (url_image.length() > 0)
+      page_value->SetString("urlImage", url_image);
     items_.push_back(page_value);
   }
   combiner_->OnItemsReady();
 }
 
 void SuggestionsSourceDiscovery::SetCombiner(SuggestionsCombiner* combiner) {
   DCHECK(!combiner_);
   combiner_ = combiner;
 }