Add signal test for each supported signal.

Add signal test for each supported signal.

BUG=
R=sgjesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=32648

[Søren Gjesse, 2014-02-13 10:54:26]

lgtm

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
File tests/standalone/io/signals_test.dart (right):

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
tests/standalone/io/signals_test.dart:53:
process.stderr.transform(UTF8.decoder).listen(print);
Debug print?

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
tests/standalone/io/signals_test.dart:91: 
Don't you need to skip some of these on Windows?

[Anders Johnsen, 2014-02-13 12:08:02]

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
File tests/standalone/io/signals_test.dart (right):

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
tests/standalone/io/signals_test.dart:53:
process.stderr.transform(UTF8.decoder).listen(print);
On 2014/02/13 10:54:27, Søren Gjesse wrote:
> Debug print?

Done.

https://codereview.chromium.org/163273002/diff/1/tests/standalone/io/signals_...
tests/standalone/io/signals_test.dart:91: 
On 2014/02/13 10:54:27, Søren Gjesse wrote:
> Don't you need to skip some of these on Windows?

Already filtered out, see 10 lines above.

[Anders Johnsen, 2014-02-13 12:08:21]

Committed patchset #2 manually as r32648 (presubmit successful).