Add support for big integers to the native message format

runtime/include/dart_api.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 INCLUDE_DART_API_H_
 #define INCLUDE_DART_API_H_
 
 /** \mainpage Dart Embedding API Reference
  *
  * Dart is a class-based programming language for creating structured
@@ skipping 531 matching lines @@
  * data outside the Dart heap. These objects are totally detached from
  * the Dart heap. Only a subset of the Dart objects have a
  * representation as a Dart_CObject.
  */
 struct Dart_CObject {
   enum Type {
     kNull = 0,
     kBool,
     kInt32,
     kInt64,
+    kBigint,
     kDouble,
     kString,
     kArray,
     kByteArray,
     kNumberOfTypes
   };
   Type type;
   union {
     bool as_bool;
     int32_t as_int32;
     int64_t as_int64;
     double as_double;
     char* as_string;
+    char* as_bigint;
     struct {
       int length;
       Dart_CObject** values;
     } as_array;
     struct {
       int length;
       uint8_t* values;
     } as_byte_array;
   } value;
 };
@@ skipping 893 matching lines @@
 
 // --- Profiling support ----
 
 // External pprof support for gathering and dumping symbolic
 // information that can be used for better profile reports for
 // dynamically generated code.
 DART_EXPORT void Dart_InitPprofSupport();
 DART_EXPORT void Dart_GetPprofSymbolInfo(void** buffer, int* buffer_size);
 
 #endif  // INCLUDE_DART_API_H_