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

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

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageViewHolder.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageViewHolder.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageViewHolder.java
new file mode 100644
index 0000000000000000000000000000000000000000..386facab1e02b30d7e56401e2b496d7058add20f
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPageViewHolder.java
@@ -0,0 +1,48 @@
+// Copyright 2015 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;
+
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+
+import org.chromium.chrome.browser.ntp.NewTabPageCardsManager.NewTabPageListItem;
+import org.chromium.chrome.browser.ntp.snippets.SnippetsManager;
+
+/**
+ * A class that represents an item we want to display on the NTP. An item can be anything that will
+ * be displayed on the NTP RecyclerView.
+ */
+public abstract class NewTabPageViewHolder extends RecyclerView.ViewHolder {
+    private final SnippetsManager mManager;
+
+    /**
+     * 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
+     * @param manager The SnippetsManager object used to open an article
+     */
+    public NewTabPageViewHolder(View itemView, SnippetsManager manager) {
+        super(itemView);
+        mManager = manager;
+    }
+
+    /**
+     * Opens the given URL
+     *
+     * @param url The URL to open.
+     */
+    protected void loadUrl(String url) {

[dgn, 2016/03/25 16:29:20]

it can be anything? but still somehow can load urls? uh?

[dgn, 2016/03/25 16:31:24]

Oops, sent notes I made before I was done looking through the entire CL. Please
ignore.

+        mManager.loadUrl(url);
+    }
+
+    /**
+     * Called when the NTP cards adapter is requested to update the currently visible ViewHolder
+     * with data.
+     *
+     * @param cardItem The NewTabPageListItem object that holds the data for this ViewHolder
+     */
+    public abstract void onBindViewHolder(NewTabPageListItem cardItem);
+}