I'm choosing not to add a section to the README until the feature is
complete. I don't want to encourage people to use tags for long-term
testing until we support a configuration that can include the set of
valid tags.

This makes a few behavioral changes to the original patch:

* Multiple values passed to --tags are interpreted as an intersection
  rather than a union (so --tags=a,b matches only tests tagged both "a"
  and "b").

* The @Tag annotation Now takes a mandatory argument that must be an
  Iterable<String>, rather than an optional argument that could be a
  String.

This adds missing Test.groupIDs and PrintEvent.testID fields, and adds a
description to clarify the purpose of FutureEvent. It also now verifies
that the protocol version is compatible.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1487753003 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1475543002 .

This reverts commit 71bfbdcd. This
commit was causing intermittent stack overflows after running tests. I'm
reverting so we can get 0.12.6 out immediately; I'll re-apply once I
have time to fix the issues.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1465403002 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1469863005 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1472883003 .

When a group was skipped, it was being filtered out entirely since it
had no tests. This preserves it so that it can print a skip message.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1471963002 .

Closes #11

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1461293005 .

1.16 is the first version that may remove package symlinks by default,
which will break test.

Closes #360

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1463023002 .

These is useful for #335. It will allow the test runner to detect when
it can pause normal command-line output and present an interface for
re-running tests.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1422963004 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1414793015 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1426973002 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1417943004 .

Closes #349

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1407593002 .

Closes #347

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1397903003 .

Closes #343

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1394103004 .

Closes #18

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1400743002 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1395223002 .

R=nweiz@google.com

Review URL: https://codereview.chromium.org//1394683002 .

This is necessary for #18, since the root group may have
setUpAll/tearDownAll metadata that needs to be preserved and shouldn't
be shunted into the Suite.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1390883002 .

Closes #344

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1384213003 .

This is groundwork for #18

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1379203002 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1372353003 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1375413002 .

R=kevmoo@google.com
BUG=

Review URL: https://codereview.chromium.org//1374783004 .

Closes #313

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1369613002 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1364893004 .

We can express this purely in the Declarer, which makes the LocalTest
and Invoker APIs cleaner.

R=kevmoo@google.com, rnystrom@google.com

Review URL: https://codereview.chromium.org//1361303002 .

These were passing in --package-root manually, which is no longer
necessary now that pub passes --packages.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1316213003 .

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1306243009 .

Fix link to `throwsA()`

(Was a copy-paste error.)