New APIs for external byte arrays

runtime/vm/dart_api_impl_test.cc

Index: runtime/vm/dart_api_impl_test.cc
diff --git a/runtime/vm/dart_api_impl_test.cc b/runtime/vm/dart_api_impl_test.cc
index fe8c40029f507e5a18c0a31da9c670750800ddff..17831ce3250dc88cf301a900b8980b3351560242 100644
--- a/runtime/vm/dart_api_impl_test.cc
+++ b/runtime/vm/dart_api_impl_test.cc
@@ -810,6 +810,7 @@ TEST_CASE(ByteArrayAccess) {
   Dart_Handle byte_array1 = Dart_NewByteArray(10);
   EXPECT_VALID(byte_array1);
   EXPECT(Dart_IsByteArray(byte_array1));
+  EXPECT(!Dart_IsByteArrayExternal(byte_array1));
   EXPECT(Dart_IsList(byte_array1));
 
   intptr_t length = 0;
@@ -1103,8 +1104,13 @@ TEST_CASE(ExternalByteArrayAccess) {
   Dart_Handle obj = Dart_NewExternalByteArray(data, data_length, NULL, NULL);
   EXPECT_VALID(obj);
   EXPECT(Dart_IsByteArray(obj));
+  EXPECT(Dart_IsByteArrayExternal(obj));
   EXPECT(Dart_IsList(obj));
 
+  void* raw_data = NULL;
+  EXPECT_VALID(Dart_ExternalByteArrayGetData(obj, &raw_data));
+  EXPECT(raw_data == data);
+
   void* peer = &data;  // just a non-NULL value
   EXPECT_VALID(Dart_ExternalByteArrayGetPeer(obj, &peer));
   EXPECT(peer == NULL);