Make DataTransferItemList.add(data, type) arguments mandatory

Make DataTransferItemList.add(data, type) arguments mandatory

Make DataTransferItemList.add(data, type) arguments mandatory to match the
specification:
http://www.whatwg.org/specs/web-apps/current-work/multipage/dnd.html#datatransferitemlist

DataTransferItemList is not implemented in Firefox 23 or IE10.

BUG=271424
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=156025

[do-not-use, 2013-08-12 13:40:32]

https://codereview.chromium.org/22790003/diff/3001/LayoutTests/fast/events/dr...
File LayoutTests/fast/events/drag-dataTransferItemList.html (right):

https://codereview.chromium.org/22790003/diff/3001/LayoutTests/fast/events/dr...
LayoutTests/fast/events/drag-dataTransferItemList.html:174: <div
id="console"></div>
Note that I added the console div explicitly on purpose so that it comes *after*
the select elements otherwise the drag'n drop would start failing due to the
console output showing before the select elements and altering their position.

If there is a better solution for that, please let me know.

[arv (Not doing code reviews), 2013-08-12 15:00:08]

LGTM

[haraken, 2013-08-12 15:47:51]

LGTM. Needs an approval from an API owner.

[do-not-use, 2013-08-13 10:50:43]

+jochen

[jochen (gone - plz use gerrit), 2013-08-13 13:56:34]

lgtm

[commit-bot: I haz the power, 2013-08-13 14:00:25]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/ch.dumez@sisa.samsung.com/22790003/10001

[commit-bot: I haz the power, 2013-08-13 15:47:34]

Change committed as 156025