Allow "internal" APIs to be specified in extension API schemas.

chrome/common/extensions/docs/template/api_template.html

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                 <a jscontent="name"
                    jsvalues=".href:'#property-' + name"
                    href="#property-anchor">propertyName</a>
               </li>
             </ol>
           </li>
           <li id="methodsTocTemplate" jsdisplay="functions && functions.length > 0">
             <a jsvalues=".href:'#' + getAnchorName('global', 'methods', $type)">Methods</a>
             <ol>
               <li jsselect="functions.sort(sortByName)"
-                  jsdisplay="!($this.nodoc)">
+                  jsdisplay="!disableDocs($this)">
                 <a jscontent="name"
                    jsvalues=".href:'#' + getAnchorName('method', name, $type)"
                    href="#method-anchor">methodName</a>
               </li>
             </ol>
           </li>
           <li id="eventsTocTemplate" jsdisplay="events && events.length > 0">
             <a jsvalues=".href:'#' + getAnchorName('global', 'events', $type)">Events</a>
             <ol>
               <li jsselect="events.sort(sortByName)"
-                  jsdisplay="!($this.nodoc)">
+                  jsdisplay="!disableDocs($this)">
                 <a jscontent="name"
                    jsvalues=".href:'#' + getAnchorName('event', name, $type)"
                    href="#event-anchor">eventName</a>
               </li>
             </ol>
           </li>
           <li id="typesTocTemplate" jsdisplay="types && types.length > 0">
             <a href="#types">Types</a>
             <ol>
               <li jsselect="types.sort(sortByName)"
@@ skipping 221 matching lines @@
           </div> <!-- /apiGroup -->
 
           <!-- METHODS -->
           <div id="methodsTemplate" class="apiGroup"
                jsdisplay="$this.functions && $this.functions.length > 0">
             <a jsvalues=".name:getAnchorName('global', 'methods', $scope)"></a>
             <h3 jscontent="$scope ? 'Methods of ' + $scope : 'Methods'">Methods</h3>
 
             <!-- iterates over all functions -->
             <div class="apiItem" jsselect="functions.sort(sortByName)"
-                 jsdisplay="!($this.nodoc)">
+                 jsdisplay="!disableDocs($this)">
               <a jsvalues=".name:getAnchorName('method', name, $scope)"></a> <!-- method-anchor -->
               <h4 jscontent="name">method name</h4>
 
               <div class="summary"><span jsdisplay="returns" jscontent="getTypeName(returns)">void</span>
                   <!-- Note: intentionally longer 80 columns -->
                   <span jscontent="getFullyQualifiedFunctionName($scope, $this)">chrome.module.methodName</span>(<span jsselect="parameters" jsvalues="class:optional ? 'optional' : ''"><span jsdisplay="$index">, </span><span jscontent="getTypeName($this)"></span>
                       <var><span jscontent="$this.name"></span></var></span>)</div>
 
               <div class="description">
                 <p class="todo" jsdisplay="!description">Undocumented.</p>
@@ skipping 56 matching lines @@
 
           </div>  <!-- /apiGroup -->
 
           <!-- EVENTS -->
           <div id="eventsTemplate" class="apiGroup"
                jsdisplay="$this.events && $this.events.length > 0">
             <a jsvalues=".name:getAnchorName('global', 'events', $scope)"></a>
             <h3 jscontent="$scope ? 'Events of ' + $scope : 'Events'">Events</h3>
             <!-- iterates over all events -->
             <div class="apiItem" jsselect="$this.events.sort(sortByName)"
-                 jsdisplay="!($this.nodoc)">
+                 jsdisplay="!disableDocs($this)">
               <a jsvalues=".name:getAnchorName('event', name, $scope)"></a>
               <h4 jscontent="name">event name</h4>
 
               <div class="summary">
                 <!-- Note: intentionally longer 80 columns -->
                 <span jscontent="(getObjectName($scope) || getModuleName()) + '.'" class="subdued">chrome.bookmarks</span><span jscontent="name">onEvent</span><span class="subdued">.addListener</span>(function(<span jscontent="getSignatureString($this.parameters)">Type param1, Type param2</span>) <span class="subdued">{...}</span><span jscontent="getOptionalSignatureSubstring($this.extraParameters)">, Type opt_param1, Type opt_param2</span>);
               </div>
 
               <div class="description">
                 <p class="todo" jsdisplay="!description">Undocumented.</p>
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