Support posting of external data into dart as external uint8 arrays through the Dart API.

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 867 matching lines @@
   enum Type {
     kNull = 0,
     kBool,
     kInt32,
     kInt64,
     kBigint,
     kDouble,
     kString,
     kArray,
     kUint8Array,
+    kExternalUint8Array,
     kUnsupported,
     kNumberOfTypes
   } 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;
       struct _Dart_CObject** values;
     } as_array;
     struct {
       int length;
       uint8_t* values;
     } as_byte_array;
+    struct {
+      int length;
+      uint8_t* data;
+      void* peer;
+      Dart_PeerFinalizer callback;
+    } as_external_byte_array;
   } value;
 } Dart_CObject;
 
 /**
  * Posts a message on some port. The message will contain the
  * Dart_CObject object graph rooted in 'message'.
  *
  * While the message is being sent the state of the graph of
  * Dart_CObject structures rooted in 'message' should not be accessed,
  * as the message generation will make temporary modifications to the
@@ skipping 1455 matching lines @@
 // 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);
 
 // Support for generating flow graph compiler debugging output into a file.
 typedef void (*FileWriterFunction)(const char* buffer, int64_t num_bytes);
 DART_EXPORT void Dart_InitFlowGraphPrinting(FileWriterFunction function);
 
 #endif  // INCLUDE_DART_API_H_