[co19] Roll co19 to a8f7aa15ab860a309667168243bda01fda0794df

From this roll on forward, co19_2 is tracking the pre-nnbd branch rather than the master branch in
the co19 repo. The master branch (the NNBD fork of co19) will be re-introduced as a different suite
later.

Issues reported:
dart-lang/co19#492 (ShortCircuitOperators_A01_t12 test is wrong)
dart-lang/co19#493 (ShortCircuitOperators_A04_t27 has a syntax error)
dart-lang/co19#494 (ShortCircuitOperators_A03_t12 is an invalid test)

2019-10-04 irina.arkhipets@gmail.com Issue 490: useless constant-update-2018 option removed from the tests.
2019-10-04 irina.arkhipets@gmail.com Issue 490: useless constant-update-2018 option removed from the tests.
2019-10-04 sgrekhov@unipro.ru Fixes 484. Use floating point value which decimal part
2019-10-04 sgrekhov@unipro.ru Fixes 486. Fix test expectations (method call has higher priority than unary minus)
2019-10-04 sgrekhov@unipro.ru Fixes 483. Use List instead of Iterable
2019-10-04 irina.arkhipets@gmail.com Issue 485, 488: test expectations corrected.
2019-09-30 irina.arkhipets@gmail.com Issue 477: More tests for constant short circuit operations added.
2019-09-30 irina.arkhipets@gmail.com Issue 477: More tests for constant short circuit operations added.
2019-09-25 irina.arkhipets@gmail.com Issue 481: Test expanded into A Function(Null) instead of A Function(A) by the instantiate-to-bound algorithm.
2019-09-23 irina.arkhipets@gmail.com Issue 477: tests for Constant-2019-update added.
2019-09-19 sgrekhov@unipro.ru Fixes 480. Use '==' for checking actual type
2019-09-17 irina.arkhipets@gmail.com Issue 477: tests for Constant-2019-update added.
2019-09-17 irina.arkhipets@gmail.com Issue 477: tests for Constant-2019-update added.
2019-09-17 sgrekhov@unipro.ru NNBD tests removed from this legacy branch
2019-09-16 irina.arkhipets@gmail.com Issue 477: tests for short circuit operators added.
2019-09-13 sgrekhov@unipro.ru 466. Subtyping tests for NNBD added.
2019-09-12 sgrekhov@unipro.ru 466. Subtyping tests for NNBDc. Copyright year updated
2019-09-12 sgrekhov@unipro.ru 466. Subtyping tests for NNBDc. Right Object tests added
2019-09-11 sgrekhov@unipro.ru 464. Added tests for legacy type fields
2019-09-11 irina.arkhipets@gmail.com Issue 465: tests for Generics in NNBD added.
2019-09-10 irina.arkhipets@gmail.com Issue 465: test for Generics in NNBD added.
2019-09-10 sgrekhov@unipro.ru 466. Subtyping tests changed according to NNBD spec
2019-09-09 sgrekhov@unipro.ru 466. Subtyping tests changed according to NNBD spec
2019-09-06 irina.arkhipets@gmail.com Issue 465: tests for Generics in NNBD added.
2019-09-06 sgrekhov@unipro.ru More tests for type Never
2019-09-05 irina.arkhipets@gmail.com Issue 465: tests for Generics in NNBD added.
2019-09-05 sgrekhov@unipro.ru Fix using and checking of Never
2019-09-04 sgrekhov@unipro.ru Fixes 464. Legacy-libraries tests added
2019-09-04 irina.arkhipets@gmail.com Fixed Issue 460: tests for Null promotion added, typos corrected.
2019-09-02 sgrekhov@unipro.ru Fixes 458. More null-aware operators tests
2019-09-02 sgrekhov@unipro.ru Fixes 459. Late fields and variables test added
2019-09-02 sgrekhov@unipro.ru 459. Late fields and variables tests added
2019-08-30 sgrekhov@unipro.ru 459. Late fields and variables tests added
2019-08-29 sgrekhov@unipro.ru 459. Late fields and variables tests added
2019-08-29 sgrekhov@unipro.ru 389. Fixed static warnings processing
2019-08-28 sgrekhov@unipro.ru 458. Null-aware operators tests added
2019-08-27 sgrekhov@unipro.ru 458. Null-aware operators tests added
2019-08-27 sgrekhov@unipro.ru Removed covariant final member
2019-08-27 sgrekhov@unipro.ru Typo and order of modifiers fixed
2019-08-23 sgrekhov@unipro.ru 461. A couple of NNBD nested nullable types tests added
2019-08-23 sgrekhov@unipro.ru 389. NNBD static errors tests. Some tests fixed, several tests added (mainly for legacy libraries)
2019-08-23 sgrekhov@unipro.ru Fixes 389. A couple of legacy types tests added
2019-08-23 sgrekhov@unipro.ru Fixes 461.Conditional expression ambiguities tests added
2019-08-23 sgrekhov@unipro.ru 461. Add nested nullable types tests
2019-08-23 sgrekhov@unipro.ru Fixes 475. Modifier 'late' must be before 'final'
2019-08-22 sgrekhov@unipro.ru 389. NNBD static errors tests. Fixed work with legacy libraries and new tests added
2019-08-22 sgrekhov@unipro.ru 461. NNBD syntax tests added for required and null-aware selector

Change-Id: Icd4d0c536f0091100aa0276ff5b836b16db0ff35
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/120782
Reviewed-by: William Hesse <whesse@google.com>

Author: athomas

DEPS

@@ -38,7 +38,7 @@ vars = {
 
   # co19 is a cipd package. Use tests/co19_2/update.sh to update this hash.
   # It requires access to the dart-build-access group, which EngProd has.
-  "co19_2_rev": "52daae49d7bff80039ff1eea36a24e98c2b9a837",
+  "co19_2_rev": "a8f7aa15ab860a309667168243bda01fda0794df",
 
   # As Flutter does, we use Fuchsia's GN and Clang toolchain. These revision
   # should be kept up to date with the revisions pulled by the Flutter engine.