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

runtime/vm/service_event.cc

Index: runtime/vm/service_event.cc
diff --git a/runtime/vm/service_event.cc b/runtime/vm/service_event.cc
index 9c9868a933e6e5b484e1711fa3d29fbaea05daac..42dd2022f53e4197148edebd27d1afa1538bb893 100644
--- a/runtime/vm/service_event.cc
+++ b/runtime/vm/service_event.cc
@@ -4,6 +4,8 @@
 
 #include "vm/service_event.h"
 
+#include "vm/message_handler.h"
+
 namespace dart {
 
 // Translate from the legacy DebugEvent to a ServiceEvent.
@@ -30,6 +32,31 @@ static ServiceEvent::EventKind TranslateEventKind(
     }
 }
 
+
+ServiceEvent::ServiceEvent(Isolate* isolate, EventKind event_kind)
+    : isolate_(isolate),
+      kind_(event_kind),
+      embedder_kind_(NULL),
+      embedder_stream_id_(NULL),
+      breakpoint_(NULL),
+      top_frame_(NULL),
+      exception_(NULL),
+      async_continuation_(NULL),
+      at_async_jump_(false),
+      inspectee_(NULL),
+      gc_stats_(NULL),
+      bytes_(NULL),
+      bytes_length_(0),
+      timestamp_(OS::GetCurrentTimeMillis()) {
+  if ((event_kind == ServiceEvent::kPauseStart) ||
+      (event_kind == ServiceEvent::kPauseExit)) {
+    timestamp_ = isolate->message_handler()->paused_timestamp();
+  } else if (event_kind == ServiceEvent::kResume) {
+    timestamp_ = isolate->last_resume_timestamp();
+  }
+}
+
+
 ServiceEvent::ServiceEvent(const DebuggerEvent* debugger_event)
     : isolate_(debugger_event->isolate()),
       kind_(TranslateEventKind(debugger_event->type())),
@@ -40,7 +67,8 @@ ServiceEvent::ServiceEvent(const DebuggerEvent* debugger_event)
       inspectee_(NULL),
       gc_stats_(NULL),
       bytes_(NULL),
-      bytes_length_(0) {
+      bytes_length_(0),
+      timestamp_(OS::GetCurrentTimeMillis()) {
   DebuggerEvent::EventType type = debugger_event->type();
   if (type == DebuggerEvent::kBreakpointReached) {
     set_breakpoint(debugger_event->breakpoint());
@@ -55,6 +83,9 @@ ServiceEvent::ServiceEvent(const DebuggerEvent* debugger_event)
       type == DebuggerEvent::kExceptionThrown) {
     set_top_frame(debugger_event->top_frame());
   }
+  if (debugger_event->timestamp() != -1) {
+    timestamp_ = debugger_event->timestamp();
+  }
 }
 
 
@@ -204,6 +235,8 @@ void ServiceEvent::PrintJSONHeader(JSONObject* jsobj) const {
   jsobj->AddProperty("type", "Event");
   jsobj->AddProperty("kind", KindAsCString());
   jsobj->AddProperty("isolate", isolate());
+  ASSERT(timestamp_ != -1);
+  jsobj->AddPropertyTimeMillis("timestamp", timestamp_);
 }
 
 }  // namespace dart