Heap maps: add VM service message.

runtime/vm/heap.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_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 221 matching lines @@
   }
 
   bool gc_in_progress() const { return gc_in_progress_; }
 
   static bool IsAllocatableInNewSpace(intptr_t size) {
     return size <= kNewAllocatableSize;
   }
 
   void PrintToJSONObject(Space space, JSONObject* object) const;
 
+  // The heap map is an array of sizes and class ids (except freelist is 0).
+  void PrintHeapMapToJSONStream(JSONStream* stream) const {
+    return old_space_->PrintHeapMapToJSONStream(stream);
+  }
+
  private:
   class GCStats : public ValueObject {
    public:
     GCStats() {}
     intptr_t num_;
     Heap::Space space_;
     Heap::GCReason reason_;
 
     class Data : public ValueObject {
     public:
@@ skipping 79 matching lines @@
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_