Add view for MegamorphicCache. Update view for ObjectPool.

runtime/observatory/lib/src/service/object.dart

 // Copyright (c) 2014, 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.
 
 part of service;
 
 /// Helper function for canceling a Future<StreamSubscription>.
 Future cancelFutureSubscription(
     Future<StreamSubscription> subscriptionFuture) async {
   if (subscriptionFuture != null) {
@@ skipping 213 matching lines @@
         switch (vmType) {
           case 'ICData':
             obj = new ICData._empty(owner);
             break;
           case 'Instructions':
             obj = new Instructions._empty(owner);
             break;
           case 'LocalVarDescriptors':
             obj = new LocalVarDescriptors._empty(owner);
             break;
+          case 'MegamorphicCache':
+            obj = new MegamorphicCache._empty(owner);
+            break;
           case 'ObjectPool':
             obj = new ObjectPool._empty(owner);
             break;
           case 'PcDescriptors':
             obj = new PcDescriptors._empty(owner);
             break;
           case 'TokenStream':
             obj = new TokenStream._empty(owner);
             break;
         }
@@ skipping 3081 matching lines @@
     dartOwner = map['_owner'];
     selector = map['_selector'];
     if (mapIsRef) {
       return;
     }
     argumentsDescriptor = map['_argumentsDescriptor'];
     entries = map['_entries'];
   }
 }
 
+class MegamorphicCache extends HeapObject {
+  @observable int mask;
+  @observable Instance buckets;
+
+  bool get canCache => false;
+  bool get immutable => false;
+
+  MegamorphicCache._empty(ServiceObjectOwner owner) : super._empty(owner);
+
+  void _update(ObservableMap map, bool mapIsRef) {
+    _upgradeCollection(map, isolate);
+    super._update(map, mapIsRef);
+
+    if (mapIsRef) {
+      return;
+    }
+
+    mask = map['_mask'];
+    buckets = map['_buckets'];
+  }
+}
+
 class Instructions extends HeapObject {
   bool get canCache => false;
   bool get immutable => true;
 
   @observable Code code;
   @observable ObjectPool objectPool;
 
   Instructions._empty(ServiceObjectOwner owner) : super._empty(owner);
 
   void _update(ObservableMap map, bool mapIsRef) {
@@ skipping 619 matching lines @@
     var v = list[i];
     if ((v is ObservableMap) && _isServiceMap(v)) {
       list[i] = owner.getFromMap(v);
     } else if (v is ObservableList) {
       _upgradeObservableList(v, owner);
     } else if (v is ObservableMap) {
       _upgradeObservableMap(v, owner);
     }
   }
 }