Adding two codelabs for cds2014.

native_client_sdk/src/doc/cds2014/index.rst

Index: native_client_sdk/src/doc/cds2014/index.rst
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+.. _cds2014:
+
+###############################################
+Chrome Dev Summit 2014 - Native Client Codelabs
+###############################################
+
+A Crossroads
+-------------
+
+For your coding pleasure, we have two codelabs.
+Depending on your interests and prior experience,
+check out one or both.
+
+Learn how easy it is to edit, build, and run NaCl applications
+all in your desktop web browser or on a Chromebook.
+
+Codelab #1 - What a difference Python Makes
+-------------------------------------------
+
+.. include:: python_summary.inc
+
+`Click here for Codelab #1 - Python on the Web <python>`_
+
+
+Codelab #2 - A Saga of Fire and Water
+-------------------------------------
+
+.. include:: cpp_summary.inc
+
+`Click here for Codelab #2 - Compile for Speed <cpp>`_