[webkit-reviews] review requested: [Bug 31718] Framework to show form validation message for invalid controls : [Attachment 71726] Patch 12 (rebased and simplified)

[bugzilla-daemon at webkit.org]

Kent Tamura <tkent at chromium.org> has asked  for review:
Bug 31718: Framework to show form validation message for invalid controls
https://bugs.webkit.org/show_bug.cgi?id=31718

Attachment 71726: Patch 12 (rebased and simplified)
https://bugs.webkit.org/attachment.cgi?id=71726&action=review