[Qt] Gesture tap highlighter needs to take overflow clip into account.

[Qt] Gesture tap highlighter needs to take overflow clip into account.
https://bugs.webkit.org/show_bug.cgi?id=84989

Patch by Zalan Bujtas <zbujtas@gmail.com> on 2012-05-18
Reviewed by Kenneth Rohde Christiansen.

.:

* ManualTests/qt/tap-highlighting-overflow-hidden.html: Added.

Source/WebCore:

Apply overflow clip on the focus ring if needed.

Follow up patches are needed to address the following cases.

[Qt] Gesture tap highlighter should take parent iframe's transform into account.
https://bugs.webkit.org/show_bug.cgi?id=86645

[Qt] Gesture tap highlighter needs to take frame clipping into account.
https://bugs.webkit.org/show_bug.cgi?id=86646

[Qt] Gesture tap highlighter's overflow clip is not always correct when
nested enclosing containers have transforms.
https://bugs.webkit.org/show_bug.cgi?id=86641

Manual test: ManualTests/qt/tap-highlighting-overflow-hidden.html

* page/GestureTapHighlighter.cpp:
(WebCore::GestureTapHighlighter::pathForNodeHighlight):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117555 268f45cc-cd09-0410-ab3c-d52691b4dbfc