Add an instance view page to the vmservice.

runtime/vm/json_stream.h

 // Copyright (c) 2013, 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_JSON_STREAM_H_
 #define VM_JSON_STREAM_H_
 
 #include "platform/json.h"
 #include "vm/allocation.h"
 
 namespace dart {
 
+class Field;
+class Instance;
+class JSONArray;
+class JSONObject;
 class Object;
-class JSONObject;
-class JSONArray;
 
 class JSONStream : ValueObject {
  public:
   explicit JSONStream(intptr_t buf_size = 256);
   ~JSONStream();
 
   TextBuffer* buffer() { return &buffer_; }
   const char* ToCString() { return buffer_.buf(); }
 
   void SetArguments(const char** arguments, intptr_t num_arguments);
@@ skipping 20 matching lines @@
 
   void OpenArray(const char* property_name = NULL);
   void CloseArray();
 
   void PrintValueBool(bool b);
   void PrintValue(intptr_t i);
   void PrintValue(double d);
   void PrintValue(const char* s);
   void PrintfValue(const char* format, ...) PRINTF_ATTRIBUTE(2, 3);
   void PrintValue(const Object& o, bool ref = true);
+  void PrintValue(const Field& f, const Instance& instance, bool ref = true);
 
   void PrintPropertyBool(const char* name, bool b);
   void PrintProperty(const char* name, intptr_t i);
   void PrintProperty(const char* name, double d);
   void PrintProperty(const char* name, const char* s);
   void PrintfProperty(const char* name, const char* format, ...)
   PRINTF_ATTRIBUTE(3, 4);
   void PrintProperty(const char* name, const Object& o, bool ref = true);
 
   void PrintPropertyName(const char* name);
@@ skipping 72 matching lines @@
     stream_->CloseArray();
   }
 
   void AddValue(bool b) const { stream_->PrintValueBool(b); }
   void AddValue(intptr_t i) const { stream_->PrintValue(i); }
   void AddValue(double d) const { stream_->PrintValue(d); }
   void AddValue(const char* s) const { stream_->PrintValue(s); }
   void AddValue(const Object& obj, bool ref = true) const {
     stream_->PrintValue(obj, ref);
   }
+  // Print a field bound to a value.  Value is looked up from 'instance'.
+  void AddValue(const Field& field,
+                const Instance& instance,
+                bool ref = true) const {
+    stream_->PrintValue(field, instance, ref);
+  }
   void AddValueF(const char* format, ...) const PRINTF_ATTRIBUTE(2, 3);
 
  private:
   JSONStream* stream_;
 
   friend class JSONObject;
 
   DISALLOW_ALLOCATION();
   DISALLOW_COPY_AND_ASSIGN(JSONArray);
 };
 
 }  // namespace dart
 
 #endif  // VM_JSON_STREAM_H_