Add an IsolateRunnable event to the service protocol. Improve service docs.

runtime/observatory/lib/src/elements/debugger.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library debugger_page_element;
 
 import 'dart:async';
 import 'dart:html';
 import 'observatory_element.dart';
 import 'package:observatory/app.dart';
@@ skipping 1464 matching lines @@
         break;
 
       case ServiceEvent.kBreakpointAdded:
       case ServiceEvent.kBreakpointResolved:
       case ServiceEvent.kBreakpointRemoved:
         if (event.owner == isolate) {
           _reportBreakpointEvent(event);
         }
         break;
 
-      case ServiceEvent.kIsolateStart:
+      case ServiceEvent.kIsolateRunnable:
       case ServiceEvent.kGraph:
       case ServiceEvent.kGC:
       case ServiceEvent.kInspect:
+        // Ignore.
         break;
 
       case ServiceEvent.kLogging:
         _consolePrinter.onEvent(event.logRecord['level'].name, event);
         break;
 
       default:
         console.print('Unrecognized event: $event');
         break;
     }
@@ skipping 852 matching lines @@
         }
       });
   }
 
   void focus() {
     $['textBox'].focus();
   }
 
   DebuggerInputElement.created() : super.created();
 }