Best zoomable area does not balance intersection with target area.

Best zoomable area does not balance intersection with target area.
https://bugs.webkit.org/show_bug.cgi?id=83148

Patch by Allan Sandfeld Jensen <allan.jensen@nokia.com> on 2012-04-04
Reviewed by Kenneth Rohde Christiansen.

Source/WebCore:

Change the two step sort to simply picking the best quotient of touch intersection with target area.

Test: touchadjustment/zoom-fatfinger.html

* page/TouchAdjustment.cpp:
(WebCore::TouchAdjustment::distanceSquaredToTargetCenterLine):
(TouchAdjustment):
(WebCore::TouchAdjustment::zoomableIntersectionQuotient):
(WebCore::TouchAdjustment::findNodeWithLowestDistanceMetric):
(WebCore::findBestClickableCandidate):
(WebCore::findBestZoomableArea):

LayoutTests:

* touchadjustment/zoom-fatfinger-expected.txt: Added.
* touchadjustment/zoom-fatfinger.html: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@113179 268f45cc-cd09-0410-ab3c-d52691b4dbfc