Created methods to surface zone memory information for each isolate and thread in JSON.

runtime/vm/thread.h

 // 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.
 
 #ifndef RUNTIME_VM_THREAD_H_
 #define RUNTIME_VM_THREAD_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/atomic.h"
@@ skipping 19 matching lines @@
 class Function;
 class GrowableObjectArray;
 class HandleScope;
 class Heap;
 class Instance;
 class Isolate;
 class Library;
 class LongJumpScope;
 class Object;
 class OSThread;
+class JSONObject;
 class PcDescriptors;
 class RawBool;
 class RawObject;
 class RawCode;
 class RawError;
 class RawGrowableObjectArray;
 class RawString;
 class RuntimeEntry;
 class Smi;
 class StackResource;
@@ skipping 589 matching lines @@
   // Visit all object pointers.
   void VisitObjectPointers(ObjectPointerVisitor* visitor, bool validate_frames);
 
   bool IsValidLocalHandle(Dart_Handle object) const;
   int CountLocalHandles() const;
   int ZoneSizeInBytes() const;
   void UnwindScopes(uword stack_marker);
 
   void InitVMConstants();
 
+#ifndef PRODUCT
+  void PrintJSON(JSONStream* stream) const;
+#endif
+
  private:
   template <class T>
   T* AllocateReusableHandle();
 
   // Accessed from generated code:
   uword stack_limit_;
   uword stack_overflow_flags_;
   Isolate* isolate_;
   Heap* heap_;
   uword top_exit_frame_info_;
@@ skipping 117 matching lines @@
 // Disable thread interrupts.
 class DisableThreadInterruptsScope : public StackResource {
  public:
   explicit DisableThreadInterruptsScope(Thread* thread);
   ~DisableThreadInterruptsScope();
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_THREAD_H_