Begin implementing a debugger page in Observatory.

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

 <link rel="import" href="../../../../packages/polymer/polymer.html">
 <link rel="import" href="action_link.html">
 <link rel="import" href="function_ref.html">
 <link rel="import" href="isolate_ref.html">
 <link rel="import" href="observatory_element.html">
 <link rel="import" href="script_inset.html">
 <link rel="import" href="script_ref.html">
 <polymer-element name="isolate-summary" extends="observatory-element">
   <template>
     <link rel="stylesheet" href="css/shared.css">
@@ skipping 134 matching lines @@
             <div class="memberValue">
               {{ isolate.oldSpace.used | formatSize }}
               of
               {{ isolate.oldSpace.capacity | formatSize }}
             </div>
           </div>
         </div>
         <br>
         <div class="memberItem">
           <div class="memberValue">
+            See <a on-click="{{ goto }}" _href="{{ gotoLink('/debugger' + isolate.link) }}">debugger</a>
+          </div>
+        </div>
+        <div class="memberItem">
+          <div class="memberValue">
             See <a on-click="{{ goto }}" _href="{{ gotoLink('/class-tree' + isolate.link) }}">class hierarchy</a>
           </div>
         </div>
         <div class="memberItem">
-          <div class="memberValue">
-            See <a on-click="{{ goto }}" _href="{{ gotoLink(isolate.relativeLink('stacktrace')) }}">stack trace</a>
-          </div>
-        </div>
-        <div class="memberItem">
           <div class="memberValue">
             See <a on-click="{{ goto }}" _href="{{ gotoLink(isolate.relativeLink('profile')) }}">cpu profile</a>
           </div>
         </div>
         <div class="memberItem">
           <div class="memberValue">
             See <a on-click="{{ goto }}" _href="{{ gotoLink(isolate.relativeLink('allocationprofile')) }}">allocation profile</a>
           </div>
         </div>
         <div class="memberItem">
@@ skipping 22 matching lines @@
   </template>
 </polymer-element>
 
 <polymer-element name="isolate-counter-chart" extends="observatory-element">
   <template>
     <div id="counterPieChart" style="height: 200px"></div>
   </template>
 </polymer-element>
 
 <script type="application/dart" src="isolate_summary.dart"></script>