Add new NTP layout with snippet cards and hide it behind a flag

chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
index 05eda5aad16868f435b934728e4db5d06ae2ddba..2671a4034a332686561007f02c361cb30f7985af 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/snippets/SnippetHeaderItemViewHolder.java
@@ -7,21 +7,16 @@ package org.chromium.chrome.browser.ntp.snippets;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.TextView;
 
 import org.chromium.chrome.R;
-import org.chromium.chrome.browser.ntp.snippets.SnippetsManager.SnippetHeader;
-import org.chromium.chrome.browser.ntp.snippets.SnippetsManager.SnippetListItem;
+import org.chromium.chrome.browser.ntp.NewTabPageCardsManager.NewTabPageListItem;
 
 /**
  * A class that represents the view for a header of a group of card snippets.
  */
-class SnippetHeaderItemViewHolder extends SnippetListItemViewHolder {
-    private TextView mHeaderTextView;
-
+class SnippetHeaderItemViewHolder extends NewTabPageListItemViewHolder {
     public SnippetHeaderItemViewHolder(View view, SnippetsManager manager) {
         super(view, manager);
-        mHeaderTextView = (TextView) view.findViewById(R.id.snippets_list_header);
     }
 
     /**
@@ -36,11 +31,5 @@ class SnippetHeaderItemViewHolder extends SnippetListItemViewHolder {
     }
 
     @Override
-    public void onBindViewHolder(SnippetListItem snippetItem) {
-        SnippetHeader item = (SnippetHeader) snippetItem;
-
-        String headerText = mHeaderTextView.getContext().getString(
-                R.string.snippets_header, item.mRecommendationBasis);
-        mHeaderTextView.setText(headerText);
-    }
+    public void onBindViewHolder(NewTabPageListItem snippetItem) {}
 }