Begin migrating the vm service from a rest-style interface to a json-rpc style interface.

runtime/observatory/lib/src/elements/cpu_profile.html

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="code_ref.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="nav_bar.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="sliding_checkbox.html">
 
 <polymer-element name="cpu-profile" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
     <nav-bar>
       <top-nav-menu></top-nav-menu>
-      <isolate-nav-menu isolate="{{ profile.isolate }}"></isolate-nav-menu>
-      <nav-menu link="{{ profile.isolate.relativeLink('profile') }}" anchor="cpu profile" last="{{ true }}"></nav-menu>
+      <isolate-nav-menu isolate="{{ isolate }}"></isolate-nav-menu>
+      <nav-menu link="{{ '/profiler' + isolate.link }}" anchor="cpu profile" last="{{ true }}"></nav-menu>
       <nav-refresh callback="{{ refresh }}"></nav-refresh>
       <nav-control></nav-control>
     </nav-bar>
     <style>
       .table {
         border-collapse: collapse!important;
         width: 100%;
         margin-bottom: 20px
       }
       .table thead > tr > th,
@@ skipping 99 matching lines @@
          <div class="memberValue">{{ sampleDepth }} stack frames</div>
         </div>
         <div class="memberItem">
          <div class="memberName">Display cutoff</div>
          <div class="memberValue">{{ displayCutoff }}</div>
         </div>
         <div class="memberItem">
          <div class="memberName">Tags</div>
          <div class="memberValue">
           <select value="{{tagSelector}}">
-            <option value="uv">User &gt; VM</option>
-            <option value="u">User</option>
-            <option value="vu">VM &gt; User</option>
-            <option value="v">VM</option>
-            <option value="hide">None</option>
+            <option value="UserVM">User &gt; VM</option>
+            <option value="UserOnly">User</option>
+            <option value="VMUser">VM &gt; User</option>
+            <option value="VMOnly">VM</option>
+            <option value="None">None</option>
           </select>
          </div>
         </div>
       </div>
       <hr>
       <table id="tableTree" class="table">
         <thead id="tableTreeheader">
           <tr>
             <th>Method</th>
             <th>Self</th>
           </tr>
         </thead>
         <tbody id="tableTreeBody">
         </tbody>
       </table>
     </div>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="cpu_profile.dart"></script>