fix js_interop_test for browsers without Object.observe

fix js_interop_test for browsers without Object.observe

the test assumed Dart timing, which would be next microtask, but since this is a JS element it is updated later.

Committed: https://code.google.com/p/dart/source/detail?r=38054

[Jennifer Messerly, 2014-07-08 08:37:07]

TBR

[Jennifer Messerly, 2014-07-08 08:37:18]

Committed patchset #1 manually as r38054 (presubmit successful).

[Siggi Cherem (dart-lang), 2014-07-08 16:50:38]

lgtm

https://codereview.chromium.org/372193003/diff/1/pkg/polymer/test/js_interop_...
File pkg/polymer/test/js_interop_test.dart (right):

https://codereview.chromium.org/372193003/diff/1/pkg/polymer/test/js_interop_...
pkg/polymer/test/js_interop_test.dart:98: return
_onTextChanged(jsElem.shadowRoot).then((_) {
could we replace this with:
  jsElem.onMutation(jsElem.shadowRoot).then
?

[Jennifer Messerly, 2014-07-08 18:39:18]

Thanks Siggi!

https://codereview.chromium.org/372193003/diff/1/pkg/polymer/test/js_interop_...
File pkg/polymer/test/js_interop_test.dart (right):

https://codereview.chromium.org/372193003/diff/1/pkg/polymer/test/js_interop_...
pkg/polymer/test/js_interop_test.dart:98: return
_onTextChanged(jsElem.shadowRoot).then((_) {
On 2014/07/08 16:50:38, Siggi Cherem (dart-lang) wrote:
> could we replace this with:
>   jsElem.onMutation(jsElem.shadowRoot).then
> ?

no, for two reasons:

* jsElem is a JS element so it won't expose onMutation; we'd need .callMethod:
https://github.com/dart-lang/core-elements/issues/45

* onMutation doesn't look for characterData changes, see "characterData: true"
below vs
https://github.com/Polymer/polymer-dev/blob/27b6f83923125d658806a2086543c91e0...