[NTP] Propagate OfflineId from C++ for Downloads.

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 df9de4ac120d1195a16b50096a8357d779a05b6f..a6d0382ef7766c6723630e7a6db14de66ce97a7c 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
@@ -74,9 +74,6 @@ public class SnippetArticle {
     /** The tab id of the corresponding tab (only for recent tab articles). */
     private String mRecentTabId;
 
-    /** The offline page id (only for recent tab articles). */
-    private String mRecentTabOfflinePageId;
-
     /** The offline id of the corresponding offline page, if any. */
     private Long mOfflinePageOfflineId;
 
@@ -175,6 +172,16 @@ public class SnippetArticle {
         mDownloadAssetMimeType = mimeType;
     }
 
+    /**
+     * Marks the article suggestion as a download offline page with the given id. May only be called
+     * if this snippet belongs to DOWNLOADS category.
+     */
+    public void setDownloadOfflinePageData(String offlinePageId) {
+        assert isDownload();
+        mIsDownloadedAsset = false;
+        setOfflinePageOfflineId(Long.parseLong(offlinePageId));
+    }
+
     public boolean isRecentTab() {
         return mCategory == KnownCategories.RECENT_TABS;
     }
@@ -189,22 +196,13 @@ public class SnippetArticle {
     }
 
     /**
-     * @return the corresponding recent tab offline page id. May only be called if this snippet is a
-     * recent tab article.
-     */
-    public String getRecentTabOfflinePageId() {
-        assert isRecentTab();
-        return mRecentTabOfflinePageId;
-    }
-
-    /**
      * Sets tab id and offline page id for recent tab articles. May only be called if this snippet
      * is a recent tab article.
      */
     public void setRecentTabData(String tabId, String offlinePageId) {
         assert isRecentTab();
         mRecentTabId = tabId;
-        mRecentTabOfflinePageId = offlinePageId;
+        setOfflinePageOfflineId(Long.parseLong(offlinePageId));
     }
 
     /** Sets offline id of the corresponding to the snippet offline page. Null to clear.*/