[NTP::SectionOrder] Propagate category rank from UI through the bridge.

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 088ee0ac5b9c8190e1ce233fe6a6d697bf86370b..acb529e9137622de7e6178b77b6706d6b21d25dc 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
@@ -80,6 +80,7 @@ public class SuggestionsSection extends InnerNode {
         private final List<SnippetArticle> mSuggestions = new ArrayList<>();
         private final NewTabPageManager mNewTabPageManager;
         private final SuggestionsCategoryInfo mCategoryInfo;
+        private int mCategoryIndex;
 
         public SuggestionsList(NewTabPageManager newTabPageManager,
                 SuggestionsCategoryInfo categoryInfo) {
@@ -87,6 +88,14 @@ public class SuggestionsSection extends InnerNode {
             mCategoryInfo = categoryInfo;
         }
 
+        public void setCategoryIndex(int categoryIndex) {
+            mCategoryIndex = categoryIndex;
+        }
+
+        public int getCategoryIndex() {
+            return mCategoryIndex;
+        }
+
         @Override
         public int getItemCount() {
             return mSuggestions.size();
@@ -105,7 +114,8 @@ public class SuggestionsSection extends InnerNode {
             checkIndex(position);
             assert holder instanceof SnippetArticleViewHolder;
             ((SnippetArticleViewHolder) holder)
-                    .onBindViewHolder(getSuggestionAt(position), mCategoryInfo, payloads);
+                    .onBindViewHolder(
+                            getSuggestionAt(position), mCategoryInfo, payloads, mCategoryIndex);
         }
 
         @Override
@@ -426,6 +436,14 @@ public class SuggestionsSection extends InnerNode {
         return mCategoryInfo;
     }
 
+    public int getCategoryIndex() {
+        return mSuggestionsList.getCategoryIndex();
+    }
+
+    public void setCategoryIndex(int categoryIndex) {
+        mSuggestionsList.setCategoryIndex(categoryIndex);
+    }
+
     public String getHeaderText() {
         return mHeader.getHeaderText();
     }