Make elementFromPoint() arguments non-optional

http://dev.w3.org/csswg/cssom-view/#extensions-to-the-document-interface
http://w3c.github.io/webcomponents/spec/shadow/#the-shadowroot-interface

Document.elementFromPoint() throws with too few arguments in Firefox
Nightly and IE11, making this likely Web compatibly.

ShadowRoot.elementFromPoint() has only been shipped in Blink, so stuff
could break, but it does not seem likely enough to warrant use counters.

Review URL: https://codereview.chromium.org/812173002

git-svn-id: svn://svn.chromium.org/blink/trunk@187443 bbb929c8-8fbe-4397-9dbb-9b2b20218538
8 files changed
tree: ac601b7c0e0535246ad47e853f6991bdab8253b8
  1. third_party/