Remember when an isolate was paused and subtly display it in Obseravatory

runtime/vm/service.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 966 matching lines @@
       JSONObject params(&jsobj, "params");
       params.AddProperty("streamId", echo_stream.id());
       {
         JSONObject event(&params, "event");
         event.AddProperty("type", "Event");
         event.AddProperty("kind", "_Echo");
         event.AddProperty("isolate", isolate);
         if (text != NULL) {
           event.AddProperty("text", text);
         }
+        event.AddPropertyTimeMillis("timestamp", OS::GetCurrentTimeMillis());
       }
     }
   }
   const String& message = String::Handle(String::New(js.ToCString()));
   uint8_t data[] = {0, 128, 255};
   SendEventWithData(echo_stream.id(), "_Echo", message, data, sizeof(data));
 }
 
 
 static bool TriggerEchoEvent(Isolate* isolate, JSONStream* js) {
@@ skipping 1539 matching lines @@
       jsobj.AddProperty("jsonrpc", "2.0");
       jsobj.AddProperty("method", "streamNotify");
       {
         JSONObject params(&jsobj, "params");
         params.AddProperty("streamId", graph_stream.id());
         {
           JSONObject event(&params, "event");
           event.AddProperty("type", "Event");
           event.AddProperty("kind", "_Graph");
           event.AddProperty("isolate", isolate);
+          event.AddPropertyTimeMillis("timestamp", OS::GetCurrentTimeMillis());
 
           event.AddProperty("chunkIndex", i);
           event.AddProperty("chunkCount", num_chunks);
           event.AddProperty("nodeCount", node_count);
         }
       }
     }
 
     const String& message = String::Handle(String::New(js.ToCString()));
 
@@ skipping 312 matching lines @@
   jsobj.AddProperty("hostCPU", HostCPUFeatures::hardware());
   jsobj.AddProperty("version", Version::String());
   // Send pid as a string because it allows us to avoid any issues with
   // pids > 53-bits (when consumed by JavaScript).
   // TODO(johnmccutchan): Codify how integers are sent across the service.
   jsobj.AddPropertyF("pid", "%" Pd "", OS::ProcessId());
   jsobj.AddProperty("_assertsEnabled", isolate->flags().asserts());
   jsobj.AddProperty("_typeChecksEnabled", isolate->flags().type_checks());
   int64_t start_time_millis = (Dart::vm_isolate()->start_time() /
                                kMicrosecondsPerMillisecond);
-  jsobj.AddProperty64("startTime", start_time_millis);
+  jsobj.AddPropertyTimeMillis("startTime", start_time_millis);
   // Construct the isolate list.
   {
     JSONArray jsarr(&jsobj, "isolates");
     ServiceIsolateVisitor visitor(&jsarr);
     Isolate::VisitIsolates(&visitor);
   }
   return true;
 }
 
 
@@ skipping 245 matching lines @@
     ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart