Adding two codelabs for cds2014.

native_client_sdk/src/doc/nacldev/setup_app.inc

Index: native_client_sdk/src/doc/nacldev/setup_app.inc
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+Setup
+-----
+
+For this codelab, you will need to install the our
+Beta NaCl Dev Environment App in your web browser.
+
+.. raw:: html
+
+  <a href="https://chrome.google.com/webstore/detail/nacl-development-environm/aljpgkjeipgnmdpikaajmnepbcfkglfa"
+  target="_blank">Click here to install the environment.</a>
+
+You will need to click "Install" to add the NaCl Dev Environment
+to your browser.
+
+NOTE: This environment will leave a substantial (800MB) payload in your
+browser. See the cleanup section below to learn how to recover this space.
+
+Once the installation is complete, run the app.
+
+On the first run, it will download several packages.
+Once download is complete you should see a bash prompt::
+
+  bash.nmf-4.3$
+
+.. include:: ../nacldev/web_tools_note.inc
+
+.. include:: ../nacldev/navigating.inc
+
+.. include:: ../nacldev/editing.inc
+
+.. include:: ../nacldev/git.inc