Ntp: use AMP urls for content suggestions when available.

components/ntp_snippets/remote/remote_suggestions_provider.cc

 // Copyright 2015 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 "components/ntp_snippets/remote/remote_suggestions_provider.h"
 
 #include <algorithm>
 #include <iterator>
 #include <utility>
 
@@ skipping 181 matching lines @@
     const NTPSnippet::PtrVector& snippets) {
   std::vector<ContentSuggestion> result;
   for (const std::unique_ptr<NTPSnippet>& snippet : snippets) {
     // TODO(sfiera): if a snippet is not going to be displayed, move it
     // directly to content.dismissed on fetch. Otherwise, we might prune
     // other snippets to get down to kMaxSnippetCount, only to hide one of the
     // incomplete ones we kept.
     if (!snippet->is_complete()) {
       continue;
     }
-    ContentSuggestion suggestion(category, snippet->id(), snippet->url());
-    suggestion.set_amp_url(snippet->amp_url());
+    GURL url = snippet->url();
+    if (base::FeatureList::IsEnabled(kPreferAmpUrlsFeature) &&
+        !snippet->amp_url().is_empty()) {
+      url = snippet->amp_url();
+    }
+    ContentSuggestion suggestion(category, snippet->id(), url);
     suggestion.set_title(base::UTF8ToUTF16(snippet->title()));
     suggestion.set_snippet_text(base::UTF8ToUTF16(snippet->snippet()));
     suggestion.set_publish_date(snippet->publish_date());
     suggestion.set_publisher_name(base::UTF8ToUTF16(snippet->publisher_name()));
     suggestion.set_score(snippet->score());
     result.emplace_back(std::move(suggestion));
   }
   return result;
 }
 
@@ skipping 1124 matching lines @@
 RemoteSuggestionsProvider::CategoryContent::CategoryContent(CategoryContent&&) =
     default;
 
 RemoteSuggestionsProvider::CategoryContent::~CategoryContent() = default;
 
 RemoteSuggestionsProvider::CategoryContent&
 RemoteSuggestionsProvider::CategoryContent::operator=(CategoryContent&&) =
     default;
 
 }  // namespace ntp_snippets