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

runtime/vm/debugger.cc

 // Copyright (c) 2012, 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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 216 matching lines @@
       context_level_(-1),
       deopt_frame_(Array::ZoneHandle(deopt_frame.raw())),
       deopt_frame_offset_(deopt_frame_offset),
       vars_initialized_(false),
       var_descriptors_(LocalVarDescriptors::ZoneHandle()),
       desc_indices_(8),
       pc_desc_(PcDescriptors::ZoneHandle()) {
 }
 
 
+void DebuggerEvent::UpdateTimestamp() {
+  timestamp_ = OS::GetCurrentTimeMillis();
+}
+
+
 bool Debugger::HasEventHandler() {
   return ((event_handler_ != NULL) ||
           Service::isolate_stream.enabled() ||
           Service::debug_stream.enabled());
 }
 
 
 static bool ServiceNeedsDebuggerEvent(DebuggerEvent::EventType type) {
   switch (type) {
     case DebuggerEvent::kBreakpointResolved:
@@ skipping 2060 matching lines @@
 void Debugger::SetEventHandler(EventHandler* handler) {
   event_handler_ = handler;
 }
 
 
 void Debugger::Pause(DebuggerEvent* event) {
   ASSERT(!IsPaused());  // No recursive pausing.
   ASSERT(obj_cache_ == NULL);
 
   pause_event_ = event;
+  pause_event_->UpdateTimestamp();
   obj_cache_ = new RemoteObjectCache(64);
 
   InvokeEventHandler(event);
 
   pause_event_ = NULL;
   obj_cache_ = NULL;    // Zone allocated
 }
 
 
 void Debugger::EnterSingleStepMode() {
@@ skipping 691 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart