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

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index d2dade6a58f2301db89a2ddbf44d9c70cb06e160..fef771a783e52bfe9f54240abbf84197c14e6014 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -1733,6 +1733,7 @@ class ServiceEvent extends ServiceObject {
   }
 
   @observable String kind;
+  @observable DateTime timestamp;
   @observable Breakpoint breakpoint;
   @observable Frame topFrame;
   @observable Instance exception;
@@ -1745,6 +1746,7 @@ class ServiceEvent extends ServiceObject {
   @observable String exceptions;
   @observable String bytesAsString;
   @observable Map logRecord;
+
   int chunkIndex, chunkCount, nodeCount;
 
   @observable bool get isPauseEvent {
@@ -1759,6 +1761,8 @@ class ServiceEvent extends ServiceObject {
     _loaded = true;
     _upgradeCollection(map, owner);
     assert(map['isolate'] == null || owner == map['isolate']);
+    timestamp =
+        new DateTime.fromMillisecondsSinceEpoch(map['timestamp'].toInt());

[turnidge, 2015/08/25 18:25:31]

Here we are doing toInt(), but above for 'startTime' we are just passing it as
an int (e.g. line 1241).  Feels like these timestamps should be sent/processed
consistently.

[Cutch, 2015/08/25 21:54:58]

We should be calling AddPropertyTimeMillis in C++ whenever we print a timestamp.
The Isolate::PrintJSON and GetVM was just adding it as an int.

I've fixed that and added the .toInt() call for all timestamps before passing to
DateTime.fromMillisecondsSinceEpoch.

     kind = map['kind'];
     notifyPropertyChange(#isPauseEvent, 0, 1);
     name = 'ServiceEvent $kind';