Add chrome-firephp sample extensions; add sample references to devtools pages

chrome/common/extensions/docs/static/experimental.devtools.resources.html

 <!-- BEGIN AUTHORED CONTENT -->
 <p id="classSummary">
 Use the <code>chrome.experimental.devtools.resources</code> module to retrieve
 the information about network resources displayed by DevTools' Network panel.
 </p><p>
 See <a href="experimental.devtools.html">DevTools APIs summary</a> for
 general introduction to using Developer Tools APIs</a>.
 </p>
 
 <h2>Notes</h2>
@@ skipping 24 matching lines @@
 <p>The following code logs URLs of all images larger than 40KB as they are
 loaded:</p>
 
 <pre>
 chrome.experimental.devtools.resources.onFinished.addListener(function(resource) {
   if (resource.response.bodySize > 40*1024)
     experimental.chrome.devtools.log("Large image: " + resource.request.url);
 });
 </pre>
 
+<h2 id="examples">Examples</h2>
+
+<p>
+You can find examples that use this API in
+<a href="samples.html#devtools.resources">Samples</a>.
+</p>
+
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