Add support for TokenStream, LocalVarDescriptors, and PcDescriptors to service lib and generic obje…

runtime/bin/vmservice/observatory/lib/src/elements/object_common.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="class_ref.html">
 <link rel="import" href="error_view.html">
 <link rel="import" href="field_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="inbound_reference.html">
 <link rel="import" href="instance_ref.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="eval_link.html">
 
 <polymer-element name="object-common" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <div class="memberList">
 
       <div class="memberItem">
         <div class="memberName">class</div>
         <div class="memberValue">
           <class-ref ref="{{ object.clazz }}"></class-ref>
         </div>
       </div>
 
-      <div class="memberItem" title="Space for this object in memory">
-        <div class="memberName">size</div>
-        <div class="memberValue">{{ object.size | formatSize }}</div>
-      </div>
+      <template if="{{ object.size != null }}">
+        <div class="memberItem" title="Space for this object in memory">
+          <div class="memberName">size</div>
+          <div class="memberValue">{{ object.size | formatSize }}</div>
+        </div>
+      </template>
+
+      <template if="{{ object.size == null }}">
+        <div class="memberItem" title="Space for this object in memory">
+          <div class="memberName">size</div>
+          <div class="memberValue">0</div>
+        </div>
+      </template>
 
       <div class="memberItem" title="Space that would be reclaimed if references to this object were replaced with null">
         <div class="memberName">retained size</div>
         <div class="memberValue">
           <template if="{{ retainedBytes == null }}">
             <eval-link callback="{{ retainedSize }}"
                        label="[calculate]">
             </eval-link>
           </template>
           <template if="{{ retainedBytes != null }}">
@@ skipping 53 matching lines @@
             </template>
           </template>
         </div>
       </div>
 
    </div>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="object_common.dart"></script>