Several small extensions docs system fixes...

chrome/common/extensions/docs/js/api_page_generator.js

 /**
  * @fileoverview This file is the controller for generating extension
  * doc pages.
  *
  * It expects to have available via XHR (relative path):
  *   1) API_TEMPLATE which is the main template for the api pages.
  *   2) A file located at SCHEMA which is shared with the extension system and
  *      defines the methods and events contained in one api.
  *   3) (Possibly) A static version of the current page url in /static/. I.e.
  *      if called as ../foo.html, it will look for ../static/foo.html.
@@ skipping 363 matching lines @@
       lastH2 = dataNode;
       lastH2.children = [];
     } else {
       lastH2.children.push(dataNode);
     }
   });
 
   return retval;
 }
 
+// This function looks in the description for strings of the form
+// "$ref:TYPE_ID" (where TYPE_ID is something like "Tab" or "HistoryItem") and
+// substitutes a link to the documentation for that type.
+function substituteTypeRefs(description) {
+  var regexp = /\$ref\:\w+/g;
+  var matches = description.match(regexp);
+  if (!matches) {
+    return description;
+  }
+  var result = description;
+  for (var i = 0; i < matches.length; i++) {
+    var type = matches[i].split(":")[1];
+    var page = null;
+    try {
+      page = getTypeRefPage({"$ref": type});
+    } catch (error) {
+      console.log("substituteTypeRefs couldn't find page for type " + type);
+      continue;
+    }
+    var replacement = "<a href='" + page + "#type-" + type + "'>" + type +
+                      "</a>";
+    result = result.replace(matches[i], replacement);
+  }
+
+  return result;
+}
+
 function getTypeRefPage(type) {
   return typeModule[type.$ref].namespace + ".html";
 }
 
 function getPageName() {
   var pageDataName = getDataFromPageHTML("pageData-name");
   // Allow empty string to be explitly set via pageData.
   if (pageDataName == "") {
     return pageDataName;
   }
@@ skipping 80 matching lines @@
 
 function sortByName(a, b) {
   if (a.name < b.name) {
     return -1;
   }
   if (a.name > b.name) {
     return 1;
   }
   return 0;
 }