Only load a certain number of test suites at once.

Only load a certain number of test suites at once.

This helps ensure that the test runner won't run out of memory when
running many test suites that each load a large amount of code.

R=kevmoo@google.com

Committed: https://github.com/dart-lang/test/commit/68ca1a2d918de671ca001a4cd2e1ed9546a909dc

[kevmoo, 2015-06-25 03:18:31]

LGTM

...with one question

https://codereview.chromium.org/1206033004/diff/1/test/runner/signal_test.dart
File test/runner/signal_test.dart (left):

https://codereview.chromium.org/1206033004/diff/1/test/runner/signal_test.dar...
test/runner/signal_test.dart:89: expect(new Directory(_tempDir).listSync(),
isEmpty);
Why this change?

[nweiz, 2015-06-25 20:42:31]

https://codereview.chromium.org/1206033004/diff/1/test/runner/signal_test.dart
File test/runner/signal_test.dart (left):

https://codereview.chromium.org/1206033004/diff/1/test/runner/signal_test.dar...
test/runner/signal_test.dart:89: expect(new Directory(_tempDir).listSync(),
isEmpty);
On 2015/06/25 03:18:31, kevmoo wrote:
> Why this change?

We shouldn't have been testing this in the first place. The second time ^C is
sent, it's handled by Dart itself, without doing any additional cleanup. The
cleanup code is in a race with this signal handler to actually clean up the temp
dir, and the race went the other way with this CL.

[nweiz, 2015-06-25 20:43:01]

Committed patchset #1 (id:1) manually as
68ca1a2d918de671ca001a4cd2e1ed9546a909dc (presubmit successful).