This switches pub's tests over to using the stream matchers built into
test, as well as the test_descriptor, test_process, and
shelf_test_handler packages. It uses async/await rather than
scheduled_test's task queue.

This removes a layer of indirection which should make it much easier to
work on pub's test infrastructure, especially for people unfamiliar with
scheduled_test.

The actual change itself is tiny. However, almost all of pub's existing
integration tests validated the correct output by looking at the
contents of the generated "packages" dirs. :(

I fixed most of those to instead validate against the .packages file.

I didn't change the Git ones because the .packages files end up
containing paths that point to specific Git commits. Getting that
working felt like more work than it was worth right now.

When we fully remove support for packages directories, we'll want to
fix that.

Fix #1450.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//2377063002 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1585513002 .

R=rnystrom@google.com

Review URL: https://codereview.chromium.org//1215833002.

BUG=https://code.google.com/p/dart/issues/detail?id=7351
R=nweiz@google.com

Review URL: https://codereview.chromium.org//26284002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@28330 260f80e4-7a28-3924-810f-c04153c831b5

BUG=
R=nweiz@google.com

Review URL: https://codereview.chromium.org//22941002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@26040 260f80e4-7a28-3924-810f-c04153c831b5

Now that hosted deps in tests can be just like they are in normal
pubspecs since the server URL is in an env var, we can simplify
the tests.

R=nweiz@google.com

Review URL: https://codereview.chromium.org//19592015

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@25305 260f80e4-7a28-3924-810f-c04153c831b5

Review URL: https://codereview.chromium.org//16034002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@23182 260f80e4-7a28-3924-810f-c04153c831b5

BUG=http://dartbug.com/9697

Review URL: https://codereview.chromium.org//13839023

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@21237 260f80e4-7a28-3924-810f-c04153c831b5

This was originally committed as r20250. Due to issue 9294, this failed on
Windows. This commit works around that issue.

BUG=8511

Review URL: https://codereview.chromium.org//12437022

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@20264 260f80e4-7a28-3924-810f-c04153c831b5

This reverts r20250, which was failing on Windows.

BUG=8511

Review URL: https://codereview.chromium.org//12782005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@20253 260f80e4-7a28-3924-810f-c04153c831b5

BUG=8511

Review URL: https://codereview.chromium.org//12794007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@20250 260f80e4-7a28-3924-810f-c04153c831b5

Review URL: https://codereview.chromium.org//11943005

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@17300 260f80e4-7a28-3924-810f-c04153c831b5

Another take of https://codereview.chromium.org/11410033/ with status changes applied for co19 tests.

BUG=

Review URL: https://codereview.chromium.org//11369210

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@14837 260f80e4-7a28-3924-810f-c04153c831b5

BUG=

Review URL: https://codereview.chromium.org//11312203

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@14833 260f80e4-7a28-3924-810f-c04153c831b5

BUG=

Review URL: https://codereview.chromium.org//11410033

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@14829 260f80e4-7a28-3924-810f-c04153c831b5

This means all imports of unittest in our test code had to change to include 'lib' in the path.
While doing that change I changed the library/imports to the new syntax in the affected files.
Review URL: https://codereview.chromium.org//11301046

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@14443 260f80e4-7a28-3924-810f-c04153c831b5

Review URL: https://codereview.chromium.org//11093012

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@13391 260f80e4-7a28-3924-810f-c04153c831b5

Windows is slow and our large tests suites time out.

Review URL: https://codereview.chromium.org//11035066

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@13315 260f80e4-7a28-3924-810f-c04153c831b5