Migrate block 6 to Dart 2.0.

Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest #01 and
the conflict it has with the new multitest #04.

BUG=
R=rnystrom@google.com

Committed: https://github.com/dart-lang/sdk/commit/7fdc6eb1285c689da9da684b83006af70f186853

[jcollins, 2017-07-21 21:51:14]

Description was changed from

==========
Migrate block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest 01 and
the conflict it has with multitest 04.

BUG=
==========

to

==========
Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest 01 and
the conflict it has with multitest 04.

BUG=
==========

[jcollins, 2017-07-21 21:52:14]

Description was changed from

==========
Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest 01 and
the conflict it has with multitest 04.

BUG=
==========

to

==========
Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest #01 and
the conflict it has with the new multitest #04.

BUG=
==========

[jcollins, 2017-07-21 21:52:47]

jcollins@google.com changed reviewers:
+ bkonyi@google.com, rnystrom@google.com

[jcollins, 2017-07-21 21:52:48]

jcollins@google.com changed required reviewers:
+ rnystrom@google.com

[jcollins, 2017-07-21 21:52:48]

This is me learning multitests, be warned.

[Bob Nystrom, 2017-07-24 22:19:48]

lgtm

https://codereview.chromium.org/2988573002/diff/1/tests/corelib_2/double_pars...
File tests/corelib_2/double_parse_test.dart (right):

https://codereview.chromium.org/2988573002/diff/1/tests/corelib_2/double_pars...
tests/corelib_2/double_parse_test.dart:1074: 2.0); //# 03: ok
I *think* these all look OK but, full disclosure, I find multitests very hard to
read.

[jcollins, 2017-07-25 15:13:49]

Description was changed from

==========
Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest #01 and
the conflict it has with the new multitest #04.

BUG=
==========

to

==========
Migrate test block 6 to Dart 2.0.

Unusual things in this block:
- This is my first attempt to fix a multitest with various errors in it,
double_parse_test.dart.  Most of them revolve around multitest #01 and
the conflict it has with the new multitest #04.

BUG=
R=rnystrom@google.com

Committed:
https://github.com/dart-lang/sdk/commit/7fdc6eb1285c689da9da684b83006af70f186853
==========

[jcollins, 2017-07-25 15:13:50]

Committed patchset #1 (id:1) manually as
7fdc6eb1285c689da9da684b83006af70f186853.

[jcollins, 2017-07-25 16:50:24]

Patchset #2 (id:20001) has been deleted