🍝🏠 Refactor MostVisited UI management, extract it for reuse in Home.

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 01f903d782d87444cf45442f453bbfbfaf9ed0ee..3d6cef1497134960de35eb61b284d8f695fee68a 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
@@ -19,6 +19,8 @@ import org.chromium.chrome.browser.ntp.snippets.SnippetArticle;
 import org.chromium.chrome.browser.ntp.snippets.SnippetArticleViewHolder;
 import org.chromium.chrome.browser.offlinepages.OfflinePageBridge;
 import org.chromium.chrome.browser.suggestions.SuggestionsUiDelegate;
+import org.chromium.chrome.browser.suggestions.TileGrid;
+import org.chromium.chrome.browser.suggestions.TileGroup;
 import org.chromium.chrome.browser.widget.displaystyle.UiConfig;
 
 import java.util.List;
@@ -58,10 +60,11 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
      * @param uiConfig the NTP UI configuration, to be passed to created views.
      * @param offlinePageBridge used to determine if articles are available.
      * @param contextMenuManager used to build context menus.
+     * @param tileGroupDelegate if not null this is used to build a {@link TileGrid}.
      */
     public NewTabPageAdapter(SuggestionsUiDelegate uiDelegate, @Nullable View aboveTheFoldView,
             UiConfig uiConfig, OfflinePageBridge offlinePageBridge,
-            ContextMenuManager contextMenuManager) {
+            ContextMenuManager contextMenuManager, @Nullable TileGroup.Delegate tileGroupDelegate) {
         mUiDelegate = uiDelegate;
         mContextMenuManager = contextMenuManager;
 
@@ -80,6 +83,9 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
             mAboveTheFold = new AboveTheFoldItem();
             mRoot.addChild(mAboveTheFold);
         }
+        if (tileGroupDelegate != null) {
+            mRoot.addChild(new TileGrid(uiDelegate, mContextMenuManager, tileGroupDelegate));
+        }
         mRoot.addChildren(mSections, mSigninPromo, mAllDismissed, mFooter);
         if (mAboveTheFoldView == null) {
             mBottomSpacer = null;
@@ -106,6 +112,9 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
             case ItemViewType.ABOVE_THE_FOLD:
                 return new NewTabPageViewHolder(mAboveTheFoldView);
 
+            case ItemViewType.TILE_GRID:
+                return new TileGrid.ViewHolder(mRecyclerView);
+
             case ItemViewType.HEADER:
                 return new SectionHeaderViewHolder(mRecyclerView, mUiConfig);