Add class and address information to heap map; display on hover.

runtime/vm/class_table.h

 // 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.
 
 #ifndef VM_CLASS_TABLE_H_
 #define VM_CLASS_TABLE_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
 namespace dart {
 
 class Class;
 class ClassStats;
 class JSONArray;
+class JSONObject;
 class JSONStream;
 class ObjectPointerVisitor;
 class RawClass;
 
 template<typename T>
 class AllocStats {
  public:
   T new_count;
   T new_size;
   T old_count;
@@ skipping 90 matching lines @@
   void Register(const Class& cls);
 
   void RegisterAt(intptr_t index, const Class& cls);
 
   void VisitObjectPointers(ObjectPointerVisitor* visitor);
 
   void Validate();
 
   void Print();
 
-  void PrintToJSONStream(JSONStream* stream);
+  void PrintToJSONObject(JSONObject* object);
 
   static intptr_t table_offset() {
     return OFFSET_OF(ClassTable, table_);
   }
 
   // Called whenever a class is allocated in the runtime.
   void UpdateAllocatedNew(intptr_t cid, intptr_t size);
   void UpdateAllocatedOld(intptr_t cid, intptr_t size);
 
   // Called whenever a old GC occurs.
@@ skipping 35 matching lines @@
   ClassHeapStats* StatsAt(intptr_t cid);
   void UpdateLiveOld(intptr_t cid, intptr_t size);
   void UpdateLiveNew(intptr_t cid, intptr_t size);
 
   DISALLOW_COPY_AND_ASSIGN(ClassTable);
 };
 
 }  // namespace dart
 
 #endif  // VM_CLASS_TABLE_H_