🍝🏠 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 16a1db12b38fb9739520071d06724ba9f09f7823..2c36ccbdda63bb19d8a08992a252de0668ef0dcc 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
@@ -14,12 +14,14 @@ import org.chromium.base.Callback;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.chrome.browser.ntp.ContextMenuManager;
 import org.chromium.chrome.browser.ntp.UiConfig;
+import org.chromium.chrome.browser.ntp.cards.NewTabPageViewHolder.PartialBindCallback;
 import org.chromium.chrome.browser.ntp.snippets.SectionHeaderViewHolder;
 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.PartialUpdateId;
 import org.chromium.chrome.browser.suggestions.SuggestionsUiDelegate;
+import org.chromium.chrome.browser.suggestions.TileGrid;
+import org.chromium.chrome.browser.suggestions.TileGroup;
 
 import java.util.List;
 import java.util.Set;
@@ -43,6 +45,9 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
 
     @Nullable
     private final AboveTheFoldItem mAboveTheFold;
+
+    @Nullable
+    private final TileGrid mTileGrid;
     private final SectionList mSections;
     private final SignInPromo mSigninPromo;
     private final AllDismissedItem mAllDismissed;
@@ -58,10 +63,11 @@ 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 +86,12 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
             mAboveTheFold = new AboveTheFoldItem();
             mRoot.addChild(mAboveTheFold);
         }
+        if (tileGroupDelegate == null) {
+            mTileGrid = null;
+        } else {
+            mTileGrid = new TileGrid(uiDelegate, mContextMenuManager, tileGroupDelegate);
+            mRoot.addChild(mTileGrid);
+        }
         mRoot.addChildren(mSections, mSigninPromo, mAllDismissed, mFooter);
         if (mAboveTheFoldView == null) {
             mBottomSpacer = null;
@@ -106,6 +118,9 @@ 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);
 
@@ -148,17 +163,8 @@ public class NewTabPageAdapter extends Adapter<NewTabPageViewHolder> implements
         }
 
         for (Object payload : payloads) {
-            @PartialUpdateId
-            int updateId = (int) payload;
-
-            switch (updateId) {
-                case PartialUpdateId.OFFLINE_BADGE:
-                    assert holder instanceof SnippetArticleViewHolder;
-                    ((SnippetArticleViewHolder) holder).refreshOfflineBadgeVisibility();
-                    break;
-                default:
-                    assert false; // Unknown payload
-            }
+            assert payload instanceof PartialBindCallback;
+            ((PartialBindCallback) payload).onResult(holder);
         }
     }