Created methods to surface zone memory information for each isolate and thread in JSON.

runtime/vm/isolate.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/isolate.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/assert.h"
 #include "platform/text_buffer.h"
@@ skipping 2072 matching lines @@
         GrowableObjectArray::Handle(registered_service_extension_handlers());
     if (!handlers.IsNull()) {
       JSONArray extensions(&jsobj, "extensionRPCs");
       String& handler_name = String::Handle();
       for (intptr_t i = 0; i < handlers.Length(); i += kRegisteredEntrySize) {
         handler_name ^= handlers.At(i + kRegisteredNameIndex);
         extensions.AddValue(handler_name.ToCString());
       }
     }
   }
+
+  jsobj.AddProperty("threads", thread_registry_);
 }
 #endif
 
 
 void Isolate::set_tag_table(const GrowableObjectArray& value) {
   tag_table_ = value.raw();
 }
 
 
 void Isolate::set_current_tag(const UserTag& tag) {
@@ skipping 833 matching lines @@
 void IsolateSpawnState::DecrementSpawnCount() {
   ASSERT(spawn_count_monitor_ != NULL);
   ASSERT(spawn_count_ != NULL);
   MonitorLocker ml(spawn_count_monitor_);
   ASSERT(*spawn_count_ > 0);
   *spawn_count_ = *spawn_count_ - 1;
   ml.Notify();
 }
 
 }  // namespace dart