Another try.

Another try.

TBR=whesse@google.com

Committed: https://code.google.com/p/dart/source/detail?r=15675

[Bill Hesse, 2012-12-04 12:36:55]

I think this is working correctly now.  I think the remaining problems are in
other places, that are still manipulating paths as strings.  We should make the
createOutputDirectory function return a Path.

We should never need to add or remove or check slashes or backslashes by hand -
all we should need are Path.fromNative and Path.toNative and File.fromPath.

The general effect of toNative is:

Path = /E:/src/dart/build/Debug/foo/
native = E:\src\dart\build\Debug\foo\

https://codereview.chromium.org/11411345/diff/1/tools/testing/dart/test_suite...
File tools/testing/dart/test_suite.dart (right):

https://codereview.chromium.org/11411345/diff/1/tools/testing/dart/test_suite...
tools/testing/dart/test_suite.dart:1520: base = new Path(segment);
I would use base = base.append(segment) here, like below.
Path('/').append('E:') is Path('/E:'), which is what you want as a path.  All
you want to do is skip the directory check and creation.

https://codereview.chromium.org/11411345/diff/1/tools/testing/dart/test_suite...
tools/testing/dart/test_suite.dart:1525: print("======= creating $dir $base");
I would put the debug printing just before the dir.createSync(), so you know
when that is being hit.