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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageViewHolder.java
new file mode 100644
index 0000000000000000000000000000000000000000..96b2dfb4cb782a9cd16e77af1459bba84ff4cf60
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/cards/NewTabPageViewHolder.java
@@ -0,0 +1,33 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.ntp.cards;
+
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+/**
+ * Holds metadata about an item we want to display on the NTP. An item can be anything that will be
+ * displayed on the NTP RecyclerView.
+ */
+public class NewTabPageViewHolder extends RecyclerView.ViewHolder {
+    /**
+     * Constructs a NewTabPageViewHolder item used to display an part of the NTP (e.g., header,
+     * article snippet, above the fold view, etc.)
+     *
+     * @param itemView The View for this item
+     */
+    public NewTabPageViewHolder(View itemView) {
+        super(itemView);
+    }
+
+    /**
+     * Called when the NTP cards adapter is requested to update the currently visible ViewHolder
+     * with data. The default implementation does nothing.
+     *
+     * @param item The NewTabPageListItem object that holds the data for this ViewHolder
+     */
+    public void onBindViewHolder(NewTabPageListItem item) {
+    }
+}