Allow fetching personalized snippets from ChromeReader.

components/ntp_snippets/ntp_snippet.h

Index: components/ntp_snippets/ntp_snippet.h
diff --git a/components/ntp_snippets/ntp_snippet.h b/components/ntp_snippets/ntp_snippet.h
index 6cde5c9c260e88742d17e6d676372f84399fe9c5..b7c1bf031d4f0dc28374dd760cf73d5865a05ec2 100644
--- a/components/ntp_snippets/ntp_snippet.h
+++ b/components/ntp_snippets/ntp_snippet.h
@@ -100,6 +100,9 @@ class NTPSnippet {
            !best_source().publisher_name.empty();
   }
 
+  float score() const { return score_; }
+  void set_score(float score) { score_ = score; }
+
   // Public for testing.
   static base::Time TimeFromJsonString(const std::string& timestamp_str);
   static std::string TimeToJsonString(const base::Time& time);
@@ -112,9 +115,7 @@ class NTPSnippet {
   base::Time publish_date_;
   base::Time expiry_date_;
   GURL amp_url_;
-  size_t best_source_index_;
-
-  std::vector<SnippetSource> sources_;
+  float score_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippet);
 };