This adds a "--deflake" flag to test.dart. Deflaking will only run if
that flag is set.
Deflaking is time consuming and delays the information that users want
to see when most of the time they know that the result is not caused by
flakiness.
A typical session may look like this:
* Run test.dart with a broad test selector without deflaking.
* Re-run test.dart with a narrow test selector for suspected flakes with
"--deflake". This second step is optional.
Additionally, a new "--report-flakes" flag is added that can be
used to report test failures for tests known to be flaky.
Change-Id: I543d0b40c32065eb0a50338c55e7050b7887abce
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/102381
Reviewed-by: Jonas Termansen <sortie@google.com>
Alexander Thomas
14b1d2feb8