📰 Keep Suggestion sections in declaration order

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
index 9cdb5e68efefda2b8a56a70af0724bceb3c2a3f4..ea6ad003b609b39401c59519fad02c8412e66c45 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageAdapter.java
@@ -32,9 +32,9 @@
 
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
-import java.util.TreeMap;
 
 /**
  * A class that handles merging above the fold elements and below the fold cards into an adapter
@@ -62,7 +62,7 @@
     private final SpacingItem mBottomSpacer = new SpacingItem();
 
     /** Maps suggestion categories to sections, with stable iteration ordering. */
-    private final Map<Integer, SuggestionsSection> mSections = new TreeMap<>();
+    private final Map<Integer, SuggestionsSection> mSections = new LinkedHashMap<>();
 
     private class ItemTouchCallbacks extends ItemTouchHelper.Callback {
         @Override
@@ -408,6 +408,11 @@ ItemGroup getGroup(int itemPosition) {
         return null;
     }
 
+    @VisibleForTesting
+    List<ItemGroup> getGroups() {
+        return Collections.unmodifiableList(mGroups);
+    }
+
     private int getGroupPositionOffset(ItemGroup group) {
         int positionOffset = 0;
         for (ItemGroup candidateGroup : mGroups) {