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

runtime/observatory/lib/src/elements/isolate_view.dart

Index: runtime/observatory/lib/src/elements/isolate_view.dart
diff --git a/runtime/observatory/lib/src/elements/isolate_view.dart b/runtime/observatory/lib/src/elements/isolate_view.dart
index ef157c09efa87c68edca2330885f7d294d5006ef..f9093647bd0407d3134772ec8c06fe51473a07aa 100644
--- a/runtime/observatory/lib/src/elements/isolate_view.dart
+++ b/runtime/observatory/lib/src/elements/isolate_view.dart
@@ -269,6 +269,26 @@ class IsolateViewElement extends HtmlElement implements Renderable {
                 ..children = [
                   new DivElement()
                     ..classes = ['memberName']
+                    ..text = 'zone handles',

[Cutch, 2017/01/03 18:16:49]

How about something more like:

"Allocated zone handle count"

(here and below)

[bkonyi, 2017/01/03 20:00:10]

Done.

+                  new DivElement()
+                    ..classes = ['memberValue']
+                    ..text = '${_isolate.numZoneHandles}'
+                ],
+              new DivElement()
+                ..classes = ['memberItem']
+                ..children = [
+                  new DivElement()
+                    ..classes = ['memberName']
+                    ..text = 'scoped handles',
+                  new DivElement()
+                    ..classes = ['memberValue']
+                    ..text = '${_isolate.numScopedHandles}'
+                ],
+              new DivElement()
+                ..classes = ['memberItem']
+                ..children = [
+                  new DivElement()
+                    ..classes = ['memberName']
                     ..text = 'object store',
                   new DivElement()
                     ..classes = ['memberValue']