[dart:io] Adds functions to set file access and modification time

sdk/lib/io/common.dart

Index: sdk/lib/io/common.dart
diff --git a/sdk/lib/io/common.dart b/sdk/lib/io/common.dart
index 6258bcf9090372ec7f3b8b97dc5456bf464ede74..5ef4594af844d2e5b78e99f5c3ea0a062149c398 100644
--- a/sdk/lib/io/common.dart
+++ b/sdk/lib/io/common.dart
@@ -26,7 +26,7 @@ _exceptionFromResponse(response, String message, String path) {
   assert(_isErrorResponse(response));
   switch (response[_ERROR_RESPONSE_ERROR_TYPE]) {
     case _ILLEGAL_ARGUMENT_RESPONSE:
-      return new ArgumentError();
+      return new ArgumentError("$message: $path");

[Lasse Reichstein Nielsen, 2017/02/09 15:28:03]

I'm not sure this is really an argument error. 
On the other hand, as I read it, it only happens when someone sends a broken
request to the internal service, which shouldn't be able to happen. So it
probably doesn't matter what it does.

[zra, 2017/02/09 17:21:38]

Acknowledged.

     case _OSERROR_RESPONSE:
       var err = new OSError(response[_OSERROR_RESPONSE_MESSAGE],
                             response[_OSERROR_RESPONSE_ERROR_CODE]);