add JsonCode example

add JsonCode example

BUG=
R=lrn@google.com

Committed: https://github.com/dart-lang/sdk/commit/ab5af73d758f04b0b281abc8a2c9f05778bfe619

[sethladd, 2015-09-29 21:52:49]

sethladd@google.com changed reviewers:
+ lrn@google.com

[sethladd, 2015-09-29 21:52:49]

Came up from talking to a customer.

Also, fixing formatting.

Thanks for taking a look!

[Lasse Reichstein Nielsen, 2015-09-30 06:20:31]

lgtm

https://codereview.chromium.org/1376043002/diff/1/sdk/lib/convert/json.dart
File sdk/lib/convert/json.dart (right):

https://codereview.chromium.org/1376043002/diff/1/sdk/lib/convert/json.dart#n...
sdk/lib/convert/json.dart:56: *    var encoded = JSON.encode([1, 2, { "a": null
}]);
Make sure this is indented enough. It seems to be indented only 3 if the first
space after "*" isn't counted. I'd prefer to indent it by four relative to the
other text, just to be sure (and so it's obvious that it's code-formatted).

[sethladd, 2015-09-30 18:02:07]

Committed patchset #1 (id:1) manually as
ab5af73d758f04b0b281abc8a2c9f05778bfe619 (presubmit successful).

[sethladd, 2015-09-30 18:03:18]

Thanks for the review. The bug seems to be that number of intents is relative to
the *.