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

chrome/android/java/src/org/chromium/chrome/browser/ntp/v2/HeaderListItem.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/v2/HeaderListItem.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/v2/HeaderListItem.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/v2/HeaderListItem.java
new file mode 100644
index 0000000000000000000000000000000000000000..1f05c4c8adf8dedd8f2a6378595c6d4c54a18e17
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/v2/HeaderListItem.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.v2;
+
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import org.chromium.chrome.R;
+
+/**
+ * Represents the data for a header of a group of snippets
+ */
+public class HeaderListItem implements NewTabPageListItem {

[newt (away), 2016/03/31 04:16:22]

Probably should be package-private, especially with such a generic name. Maybe
call this SnippetHeaderListItem?

[dgn, 2016/03/31 13:38:32]

Done.

+
+    /**
+     * Creates the View object for displaying the header for a group of snippets
+     *
+     * @param parent The parent view for the header
+     * @return a View object for displaying a header for a group of snippets
+     */
+    public static View createView(ViewGroup parent) {
+        return LayoutInflater.from(parent.getContext())
+                .inflate(R.layout.new_tab_page_snippets_header, parent, false);
+    }
+
+    @Override
+    public int getType() {
+        return NewTabPageListItem.VIEW_TYPE_HEADER;
+    }
+}