Standardize on using "kind" to distinguish sub-varieties of a type.

runtime/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 47 matching lines @@
 
     <template if="{{ isolate.loading }}">
       <strong>loading...</strong>
     </template>
   </template>
 </polymer-element>
 
 <polymer-element name="isolate-location" extends="observatory-element">
   <template>
     <template if="{{ isolate.pauseEvent != null }}">
-      <template if="{{ isolate.pauseEvent.eventType == 'PauseStart' }}">
+      <template if="{{ isolate.pauseEvent.kind == 'PauseStart' }}">
         at isolate start
       </template>
 
-      <template if="{{ isolate.pauseEvent.eventType == 'PauseExit' }}">
+      <template if="{{ isolate.pauseEvent.kind == 'PauseExit' }}">
         at isolate exit
       </template>
 
-      <template if="{{ isolate.pauseEvent.eventType == 'PauseInterrupted' ||
-                       isolate.pauseEvent.eventType == 'PauseBreakpoint' ||
-                       isolate.pauseEvent.eventType == 'PauseException' }}">
+      <template if="{{ isolate.pauseEvent.kind == 'PauseInterrupted' ||
+                       isolate.pauseEvent.kind == 'PauseBreakpoint' ||
+                       isolate.pauseEvent.kind == 'PauseException' }}">
         <template if="{{ isolate.pauseEvent.breakpoint != null }}">
           by breakpoint
         </template>
-        <template if="{{ isolate.pauseEvent.eventType == 'PauseException' }}">
+        <template if="{{ isolate.pauseEvent.kind == 'PauseException' }}">
           by exception
         </template>
         at
         <function-ref ref="{{ isolate.topFrame['function'] }}">
         </function-ref>
         (<script-ref ref="{{ isolate.topFrame['script'] }}"
                      pos="{{ isolate.topFrame['tokenPos'] }}"></script-ref>)
       </template>
     </template>
 
@@ skipping 110 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>