New APIs for external byte arrays

runtime/include/dart_api.h

Index: runtime/include/dart_api.h
diff --git a/runtime/include/dart_api.h b/runtime/include/dart_api.h
index be97d76bc6b58782a843eb13b2e2e96f55dd3637..1ddd2108778e2effeb1ad7311441795c9913055b 100755
--- a/runtime/include/dart_api.h
+++ b/runtime/include/dart_api.h
@@ -1621,6 +1621,14 @@ DART_EXPORT Dart_Handle Dart_ListSetAsBytes(Dart_Handle list,
 DART_EXPORT bool Dart_IsByteArray(Dart_Handle object);
 
 /**
+ * Is this object an external ByteArray?
+ *
+ * An external ByteArray is a ByteArray which references a fixed array of
+ * bytes which is external to the Dart heap.
+ */
+DART_EXPORT bool Dart_IsByteArrayExternal(Dart_Handle object);
+
+/**
  * Returns a ByteArray of the desired length.
  *
  * \param length The length of the array.
@@ -1646,6 +1654,12 @@ DART_EXPORT Dart_Handle Dart_NewExternalByteArray(uint8_t* data,
                                                   Dart_PeerFinalizer callback);
 
 /**
+ * Retrieves the data pointer associated with an external ByteArray.
+ */
+DART_EXPORT Dart_Handle Dart_ExternalByteArrayGetData(Dart_Handle object,
+                                                      void** data);
+
+/**
  * Retrieves the peer pointer associated with an external ByteArray.
  */
 DART_EXPORT Dart_Handle Dart_ExternalByteArrayGetPeer(Dart_Handle object,