Change the allocation of the stdout and stderr collected by Process.runSync

runtime/bin/process.cc

 // 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.
 
 #include "bin/dartutils.h"
 #include "bin/io_buffer.h"
 #include "bin/process.h"
 #include "bin/socket.h"
 
 #include "include/dart_api.h"
@@ skipping 165 matching lines @@
   Socket::GetSocketIdNativeField(exit_handle, &exit_event);
   ProcessResult result;
   intptr_t pid;
   Process::GetProcessIdNativeField(process, &pid);
   if (Process::Wait(pid,
                     process_stdin,
                     process_stdout,
                     process_stderr,
                     exit_event,
                     &result)) {
-    Dart_Handle out =
-        IOBuffer::Create(result.stdout_data(), result.stdout_length());
-    Dart_Handle err =
-        IOBuffer::Create(result.stderr_data(), result.stderr_length());
+    Dart_Handle out = result.stdout_data();
+    if (Dart_IsError(out)) Dart_PropagateError(out);
+    Dart_Handle err = result.stderr_data();
+    if (Dart_IsError(err)) Dart_PropagateError(err);
     Dart_Handle list = Dart_NewList(4);
     Dart_ListSetAt(list, 0, Dart_NewInteger(pid));
     Dart_ListSetAt(list, 1, Dart_NewInteger(result.exit_code()));
     Dart_ListSetAt(list, 2, out);
     Dart_ListSetAt(list, 3, err);
     Dart_SetReturnValue(args, list);
   } else {
     Process::Kill(pid, 9);
     Dart_ThrowException(DartUtils::NewDartOSError());
   }
@@ skipping 86 matching lines @@
   int external_length = strlen(system_string);
   uint8_t* buffer = NULL;
   Dart_Handle external_array = IOBuffer::Allocate(external_length, &buffer);
   memmove(buffer, system_string, external_length);
   if (utf8 != system_string) free(const_cast<char*>(system_string));
   Dart_SetReturnValue(args, external_array);
 }
 
 }  // namespace bin
 }  // namespace dart