Add ContentSuggestion, ContentSuggestionCategory and ContentSuggestionProviderType

components/ntp_snippets/ntp_snippet.cc

Index: components/ntp_snippets/ntp_snippet.cc
diff --git a/components/ntp_snippets/ntp_snippet.cc b/components/ntp_snippets/ntp_snippet.cc
index d56528508a59eab0073c5c12937c836b0f4f33e8..125ec5199b2b1af20af0e86179699b262bc62455 100644
--- a/components/ntp_snippets/ntp_snippet.cc
+++ b/components/ntp_snippets/ntp_snippet.cc
@@ -8,6 +8,9 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/values.h"
+#include "components/ntp_snippets/content_suggestion.h"
+#include "components/ntp_snippets/content_suggestion_category.h"
+#include "components/ntp_snippets/content_suggestions_provider_type.h"
 #include "components/ntp_snippets/proto/ntp_snippets.pb.h"
 
 namespace {
@@ -250,6 +253,19 @@ SnippetProto NTPSnippet::ToProto() const {
   return result;
 }
 
+std::unique_ptr<ContentSuggestion> NTPSnippet::ToContentSuggestion() const {
+  std::unique_ptr<ContentSuggestion> result(new ContentSuggestion(
+      id_, ContentSuggestionsProviderType::ARTICLES,
+      ContentSuggestionCategory::ARTICLE, best_source().url));
+  result->set_amp_url(best_source().amp_url);
+  result->set_title(title_);
+  result->set_snippet_text(snippet_);
+  result->set_publish_date(publish_date_);
+  result->set_publisher_name(best_source().publisher_name);
+  result->set_score(score_);
+  return result;
+}
+
 // static
 base::Time NTPSnippet::TimeFromJsonString(const std::string& timestamp_str) {
   int64_t timestamp;