Allow fetching personalized snippets from ChromeReader.

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 d5164c56a82a1a81fb4fa30f1f0247e7c162ee1c..06c88749659d62a8fa58cd13aeb1936361727850 100644
--- a/components/ntp_snippets/ntp_snippet.cc
+++ b/components/ntp_snippets/ntp_snippet.cc
@@ -10,6 +10,7 @@
 
 namespace {
 
+const char kScore[] = "score";
 const char kContentInfo[] = "contentInfo";
 
 const char kUrl[] = "url";
@@ -142,6 +143,10 @@ std::unique_ptr<NTPSnippet> NTPSnippet::CreateFromDictionary(
     return nullptr;
   }
 
+  double score;
+  if (dict.GetDouble(kScore, &score))
+    snippet->set_score(score);
+
   return snippet;
 }
 
@@ -198,6 +203,8 @@ std::unique_ptr<base::DictionaryValue> NTPSnippet::ToDictionary() const {
   std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue);
   result->Set(kContentInfo, std::move(dict));
 
+  result->SetDouble(kScore, score_);
+
   return result;
 }