Added methods to surface number of zone and scoped handles for each isolate.

runtime/vm/thread_registry.cc

 // Copyright (c) 2015, 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/thread_registry.h"
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/lockers.h"
 
@@ skipping 87 matching lines @@
   JSONArray threads(stream);
   Thread* current = active_list_;
   while (current != NULL) {
     threads.AddValue(current);
     current = current->next_;
   }
 }
 #endif
 
 
+intptr_t ThreadRegistry::CountZoneHandles() const {
+  MonitorLocker ml(threads_lock());
+  intptr_t count = 0;
+  Thread* current = active_list_;
+  while (current != NULL) {
+    count += current->CountZoneHandles();
+    current = current->next_;
+  }
+  return count;
+}
+
+
+intptr_t ThreadRegistry::CountScopedHandles() const {
+  MonitorLocker ml(threads_lock());
+  intptr_t count = 0;
+  Thread* current = active_list_;
+  while (current != NULL) {
+    count += current->CountScopedHandles();
+    current = current->next_;
+  }
+  return count;
+}
+
+
 void ThreadRegistry::AddToActiveListLocked(Thread* thread) {
   ASSERT(thread != NULL);
   ASSERT(threads_lock()->IsOwnedByCurrentThread());
   thread->next_ = active_list_;
   active_list_ = thread;
 }
 
 
 void ThreadRegistry::RemoveFromActiveListLocked(Thread* thread) {
   ASSERT(thread != NULL);
@@ skipping 33 matching lines @@
   ASSERT(thread->os_thread_ == NULL);
   ASSERT(thread->isolate_ == NULL);
   ASSERT(thread->heap_ == NULL);
   ASSERT(threads_lock()->IsOwnedByCurrentThread());
   // Add thread to the free list.
   thread->next_ = free_list_;
   free_list_ = thread;
 }
 
 }  // namespace dart