Add migration to WebAssembly information to PNaCl / NaCl docs.

native_client_sdk/doc_generated/devguide/coding/view-focus-input-events.html

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-<section id="view-change-focus-and-input-events">
-<span id="view-focus-input-events"></span><h1 id="view-change-focus-and-input-events"><span id="view-focus-input-events"></span>View Change, Focus, and Input Events</h1>
+<b><font color="#cc0000">
+NOTE:
+Deprecation of the technologies described here has been announced
+for platforms other than ChromeOS.<br/>
+Please visit our
+<a href="/native-client/migration">migration guide</a>
+for details.
+</font></b>
+<hr/><section id="view-change-focus-and-input-events">
+<h1 id="view-change-focus-and-input-events">View Change, Focus, and Input Events</h1>
 <div class="contents local" id="contents" style="display: none">
 <ul class="small-gap">
 <li><a class="reference internal" href="#overview" id="id2">Overview</a></li>
 <li><p class="first"><a class="reference internal" href="#handling-browser-events" id="id3">Handling browser events</a></p>
 <ul class="small-gap">
 <li><a class="reference internal" href="#didchangeview" id="id4">DidChangeView()</a></li>
 <li><a class="reference internal" href="#didchangefocus" id="id5">DidChangeFocus()</a></li>
 </ul>
 </li>
 <li><p class="first"><a class="reference internal" href="#handling-input-events" id="id6">Handling input events</a></p>
@@ skipping 289 matching lines @@
 <h3 id="threading-and-blocking">Threading and blocking</h3>
 <p><code>HandleInputEvent()</code> in this example runs on the main module thread.
 However, the bulk of the work happens on a separate worker thread (see
 <code>ProcessEventOnWorkerThread</code>). <code>HandleInputEvent()</code> puts events in
 the <code>event_queue_</code> and the worker thread takes events from the
 <code>event_queue_</code>. This processing happens independently of the main
 thread, so as not to slow down the browser.</p>
 </section>
 
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