Add console to dart:io for synchronus writing to stdout and stderr

Add console to dart:io for synchronus writing to stdout and stderr

This is provided as a fallback for applications relying synchronus
writing to stdout/stderr, which was changed to be async in r41436.

R=iposva@google.com
BUG=

Committed: https://code.google.com/p/dart/source/detail?r=41801

[Paul Berry, 2014-11-14 14:06:45]

DBC

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart
File sdk/lib/io/console.dart (right):

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart#newc...
sdk/lib/io/console.dart:44: * This class had a call method so you can call it
directly. Calling
s/had/has/

[Ivan Posva, 2014-11-18 05:54:44]

LGTM -ip

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart
File sdk/lib/io/console.dart (right):

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart#newc...
sdk/lib/io/console.dart:54: void call(String message) => _sink.writeln(message);
Wondering whether we should accept any message and convert it to a string
similarly as we do with print.

[Søren Gjesse, 2014-11-18 13:51:35]

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart
File sdk/lib/io/console.dart (right):

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart#newc...
sdk/lib/io/console.dart:44: * This class had a call method so you can call it
directly. Calling
On 2014/11/14 14:06:45, Paul Berry wrote:
> s/had/has/

Done.

https://codereview.chromium.org/733463002/diff/1/sdk/lib/io/console.dart#newc...
sdk/lib/io/console.dart:54: void call(String message) => _sink.writeln(message);
On 2014/11/18 05:54:44, Ivan Posva wrote:
> Wondering whether we should accept any message and convert it to a string
> similarly as we do with print.

Good point. Changed type to Object. writeln already take an object.

[Søren Gjesse, 2014-11-18 14:08:31]

Committed patchset #1 (id:1) manually as 41801 (presubmit successful).