Use the dart2js patch for dart:convert to get latest type fixes

Use the dart2js patch for dart:convert to get latest type fixes

BUG=
R=floitsch@google.com

Committed: https://github.com/dart-lang/sdk/commit/6402ad477ddbd63c9aad37e624fb97f2afec9555

[vsm, 2017-05-24 00:00:40]

Description was changed from

==========
Use the dart2js patch for dart:convert to get latest type fixes

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

to

==========
Use the dart2js patch for dart:convert to get latest type fixes

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

[vsm, 2017-05-24 00:00:40]

vsm@google.com changed reviewers:
+ floitsch@google.com

[vsm, 2017-05-24 00:02:18]

Patch set #1 is a direct copy of the dart2js version

Patch set #2 has more type fixes to remove unnecessary runtime checks.

Note, not all patch/internal files are straight copies.  This one seems fine.

https://codereview.chromium.org/2896253003/diff/1/pkg/dev_compiler/tool/input...
File pkg/dev_compiler/tool/input_sdk/patch/convert_patch.dart (right):

https://codereview.chromium.org/2896253003/diff/1/pkg/dev_compiler/tool/input...
pkg/dev_compiler/tool/input_sdk/patch/convert_patch.dart:288: Map result =
<String, dynamic>{};
If we have Map here, the static type of result is Map<dynamic, dynamic>,
resulting in a runtime check below.

[floitsch, 2017-05-24 13:39:13]

Couldn't review. The review tool didn't show any sources.

[floitsch, 2017-05-24 13:42:44]

Managed to make it work.

LGTM.
Could you please apply the type changes to the standard library as well? (In the
worst case send me the diff and I can do it).
Thanks.

[vsm, 2017-05-24 14:33:34]

Description was changed from

==========
Use the dart2js patch for dart:convert to get latest type fixes

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

to

==========
Use the dart2js patch for dart:convert to get latest type fixes

BUG=
R=floitsch@google.com

Committed:
https://github.com/dart-lang/sdk/commit/6402ad477ddbd63c9aad37e624fb97f2afec9555
==========

[vsm, 2017-05-24 14:33:35]

Committed patchset #2 (id:10001) manually as
6402ad477ddbd63c9aad37e624fb97f2afec9555 (presubmit successful).