📰 Tweak the suggestion ranks for UMA to handle fetchMore

chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
index 71b7d4b494b5467d5516b4dd1e75fa1cd1ebb60c..3bcf62e4b8e6537c4626f267576ea337b83f313e 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/SuggestionsSection.java
@@ -165,6 +165,14 @@ public void updateSuggestionOfflineId(SnippetArticle article, Long newId) {
             notifyItemChanged(mSuggestions.indexOf(article),
                     SnippetArticleViewHolder.PARTIAL_UPDATE_OFFLINE_ID);
         }
+
+        /**
+         * @return the index of the first suggestion matching {@code suggestion}, or -1 if such
+         * an element can't be found.
+         */
+        public int indexOf(SnippetArticle suggestion) {
+            return mSuggestions.indexOf(suggestion);
+        }
     }
 
     private void setupOfflinePageBridgeObserver(NewTabPageManager manager) {
@@ -251,6 +259,14 @@ public int getSuggestionsCount() {
         return mSuggestionsList.getItemCount();
     }
 
+    /**
+     * @return the rank of the provided suggestion among the other suggestions of that section, or
+     * -1 if not found.
+     */
+    public int getSuggestionRank(SnippetArticle suggestion) {
+        return mSuggestionsList.indexOf(suggestion);
+    }
+
     public String[] getDisplayedSuggestionIds() {
         String[] suggestionIds = new String[mSuggestionsList.getItemCount()];
         for (int i = 0; i < mSuggestionsList.getItemCount(); ++i) {