Add testing resources from SkyDart branch

Add testing resources from SkyDart branch

These packages come from Dart's pub system. I've removed files specific to dart:html
and updated "package:" imports to use relative URLs.

R=eseidel@chromium.org
BUG=454613
Committed: https://chromium.googlesource.com/external/mojo/+/c7c2b7c918ac6a59a32f0e58832c2fb587e0afde

[eseidel, 2015-02-12 19:29:12]

eseidel@chromium.org changed reviewers:
+ zra@google.com

[eseidel, 2015-02-12 19:29:12]

Do we need/want to be copying matcher from Dart?

[eseidel, 2015-02-12 19:30:44]

Maybe these should be in a third_party? which we'll later make auto-downloaded
instead of checked in?  Something to convey that we're not modifying these.

[eseidel, 2015-02-12 20:19:57]

lgtm

https://codereview.chromium.org/921863002/diff/40001/sky/tests/resources/unit...
File sky/tests/resources/unit.dart (right):

https://codereview.chromium.org/921863002/diff/40001/sky/tests/resources/unit...
sky/tests/resources/unit.dart:1: import "../resources/unittest/unittest.dart";
Is this still right?

[abarth-chromium, 2015-02-12 20:22:43]

https://codereview.chromium.org/921863002/diff/40001/sky/tests/resources/unit...
File sky/tests/resources/unit.dart (right):

https://codereview.chromium.org/921863002/diff/40001/sky/tests/resources/unit...
sky/tests/resources/unit.dart:1: import "../resources/unittest/unittest.dart";
On 2015/02/12 at 20:19:57, eseidel wrote:
> Is this still right?

Nope.  Fixed.

[abarth-chromium, 2015-02-12 20:23:15]

Committed patchset #3 (id:40001) manually as
c7c2b7c918ac6a59a32f0e58832c2fb587e0afde (presubmit successful).

[zra, 2015-02-12 20:37:07]

On 2015/02/12 19:30:44, eseidel wrote:
> Maybe these should be in a third_party? which we'll later make auto-downloaded
> instead of checked in?  Something to convey that we're not modifying these.

We're starting to figure out how to get the Dart SDK including the standalone
Dart VM, pub, dartanalyze, etc. downloaded from google storage to third_party.
Once that's in place, a pub step to do the download could be part of the build.
Maybe try to coordinate with erg. I think he's doing preliminary work on this.

[abarth-chromium, 2015-02-12 20:48:21]

On 2015/02/12 at 20:37:07, zra wrote:
> We're starting to figure out how to get the Dart SDK including the standalone
Dart VM, pub, dartanalyze, etc. downloaded from google storage to third_party.
Once that's in place, a pub step to do the download could be part of the build.
Maybe try to coordinate with erg. I think he's doing preliminary work on this.

Neat.  Once that's working, we should switch over to using that for this code.