Add support for the modifiers parameter of mouseDown() and mouseUp(), and "addSelectionKey" "rangeSelectionkey" modifiers.
Add support for the modifiers parameter of mouseDown() and mouseUp(),
and "addSelectionKey" "rangeSelectionkey" modifiers.

They were introduced by http://trac.webkit.org/changeset/53498. The
test will use these features by a patch in http://webkit.org/b/33989.

BUG=10353
TEST=LayoutTests/fast/forms/listbox-deselect-scroll.html
Review URL: http://codereview.chromium.org/545166

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@36860 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser