[remote suggestions] Attach the fetch time to RemoteSnippets, ContentSnippets and SnippetArticle

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
index f3d6805d2e2b7a95a605994ff8beac62b750b2fb..6b35c3400c9163595ae1ad5479b0325f28fc2ff9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetArticle.java
@@ -36,6 +36,12 @@ public class SnippetArticle {
     /** The score expressing relative quality of the article for the user. */
     public final float mScore;
 
+    /**
+     * The time when the article was fetched from the server. This field is only used for remote
+     * suggestions.
+     */
+    public final long mFetchTimestampMilliseconds;
+
     /** The rank of this article within its section. */
     private int mPerSectionRank = -1;
 
@@ -67,15 +73,17 @@ public class SnippetArticle {
      * Creates a SnippetArticleListItem object that will hold the data.
      */
     public SnippetArticle(int category, String idWithinCategory, String title, String publisher,
-            String previewText, String url, long timestamp, float score) {
+            String previewText, String url, long publishTimestamp, float score,
+            long fetchTimestamp) {
         mCategory = category;
         mIdWithinCategory = idWithinCategory;
         mTitle = title;
         mPublisher = publisher;
         mPreviewText = previewText;
         mUrl = url;
-        mPublishTimestampMilliseconds = timestamp;
+        mPublishTimestampMilliseconds = publishTimestamp;
         mScore = score;
+        mFetchTimestampMilliseconds = fetchTimestamp;
     }
 
     @Override