[dart:io] flush() stdin before close()ing

[dart:io] flush() stdin before close()ing

Calls to close() on an IOSink do not imply that writes buffered by the
underlying StreamConsumer have been flushed. This CL adds a note
indicating this to the IOSink docs, and adds calls to flush() before
calls to close() for some calls to stdin.close() for spawned
processes in our tests.

related #28737

R=fschneider@google.com

Committed: https://github.com/dart-lang/sdk/commit/8a9a98073f20cca85999e761a90359088a3da375

[zra, 2017-02-10 17:32:13]

zra@google.com changed reviewers:
+ fschneider@google.com

[Florian Schneider, 2017-02-10 17:43:29]

Lgtm

[zra, 2017-02-10 17:55:20]

Description was changed from

==========
[dart:io] flush() stdin before close()ing

Calls to close() on an IOSink do not imply that writes buffered by the
underlying StreamConsumer have been flushed. This CL adds a note
indicating this to the IOSink docs, and adds calls to flush() before
calls to close() for some calls to stdin.close() for spawned
processes in our tests.

related #28737
==========

to

==========
[dart:io] flush() stdin before close()ing

Calls to close() on an IOSink do not imply that writes buffered by the
underlying StreamConsumer have been flushed. This CL adds a note
indicating this to the IOSink docs, and adds calls to flush() before
calls to close() for some calls to stdin.close() for spawned
processes in our tests.

related #28737

R=fschneider@google.com

Committed:
https://github.com/dart-lang/sdk/commit/8a9a98073f20cca85999e761a90359088a3da375
==========

[zra, 2017-02-10 17:55:21]

Committed patchset #1 (id:1) manually as
8a9a98073f20cca85999e761a90359088a3da375 (presubmit successful).