[NaCl SDK] Make the SDK examples buildable as a packaged app.

native_client_sdk/src/examples/resources/background.js

Index: native_client_sdk/src/examples/resources/background.js
diff --git a/native_client_sdk/src/examples/resources/background.js b/native_client_sdk/src/examples/resources/background.js
new file mode 100644
index 0000000000000000000000000000000000000000..1fc5a19b3ac8722945ca5283e58162ac9ccaa4d3
--- /dev/null
+++ b/native_client_sdk/src/examples/resources/background.js
@@ -0,0 +1,13 @@
+// Copyright (c) 2013 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.
+
+function onLaunched(launchData) {
+  chrome.app.window.create('index.html', {
+    width: 1024,
+    height: 800,
+    frame: 'none'
+  });
+}
+
+chrome.app.runtime.onLaunched.addListener(onLaunched);