Fetch notification action icons and pass them through in resources.

content/public/common/notification_resources.cc

Index: content/public/common/notification_resources.cc
diff --git a/content/public/common/notification_resources.cc b/content/public/common/notification_resources.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b4ea9abe9359df4f17f1dadf9267f7eec53edf1a
--- /dev/null
+++ b/content/public/common/notification_resources.cc
@@ -0,0 +1,13 @@
+// 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.
+
+#include "content/public/common/notification_resources.h"
+
+namespace content {
+
+NotificationResources::NotificationResources() {}
+
+NotificationResources::~NotificationResources() {}
+
+}  // namespace content