Add some additional debugging prints to the mac os watcher.

Add some additional debugging prints to the mac os watcher.

R=rnystrom@google.com

Committed: https://code.google.com/p/dart/source/detail?r=32139

[nweiz, 2014-01-29 01:05:28]

This test had a weird failure recently
(http://build.chromium.org/p/client.dart/builders/vm-mac-debug-be/builds/1329/...)
and the added debugging should help track it down.

[Bob Nystrom, 2014-01-29 17:09:53]

Nit but LGTM.

https://codereview.chromium.org/146693014/diff/1/pkg/watcher/lib/src/director...
File pkg/watcher/lib/src/directory_watcher/mac_os.dart (right):

https://codereview.chromium.org/146693014/diff/1/pkg/watcher/lib/src/director...
pkg/watcher/lib/src/directory_watcher/mac_os.dart:473: new
Chain.forTrace(stackTrace).terse.toString());
Nit, but I'd prefer this be consistent with the above. I'd probably use
interpolation and string literal concatenation here. I think we don't generally
use "+" much.

[nweiz, 2014-01-29 21:06:40]

https://codereview.chromium.org/146693014/diff/1/pkg/watcher/lib/src/director...
File pkg/watcher/lib/src/directory_watcher/mac_os.dart (right):

https://codereview.chromium.org/146693014/diff/1/pkg/watcher/lib/src/director...
pkg/watcher/lib/src/directory_watcher/mac_os.dart:473: new
Chain.forTrace(stackTrace).terse.toString());
On 2014/01/29 17:09:53, Bob Nystrom wrote:
> Nit, but I'd prefer this be consistent with the above. I'd probably use
> interpolation and string literal concatenation here. I think we don't
generally
> use "+" much.

Done.

[nweiz, 2014-01-29 21:07:05]

Committed patchset #2 manually as r32139 (presubmit successful).