https://bugs.webkit.org/show_bug.cgi?id=88254
PR #125237

Reviewed by Rob Buis.
Patch by Antonio Gomes <agomes@rim.com>

Patch implements a top-down visibleWindowRect calculation for all scrollable
elements hit-tested by a given point.

The reason on why this approach is better is that it calculates the visible
window rect from the outtermost scrollable element towards the inner ones, and
that allows it to use the visible window rect of the previous scrollable element
as the clipping rect for the current one.

Patch also changes the return vector to store ScrollViewBase pointers, so
we can make use of static_cast properly.

Internally reviewed by Jakob Petsovits.

* Api/WebPage.cpp:
(BlackBerry::WebKit::pushBackInRegionScrollable):
(BlackBerry::WebKit::WebPagePrivate::inRegionScrollableAreasForPoint):
* Api/WebPageClient.h:
* Api/WebPage_p.h:
(WebPagePrivate):
* WebKitSupport/InRegionScrollableArea.cpp:
(BlackBerry::WebKit::InRegionScrollableArea::InRegionScrollableArea):
(BlackBerry::WebKit::InRegionScrollableArea::setVisibleWindowRect):
(WebKit):
(BlackBerry::WebKit::InRegionScrollableArea::visibleWindowRect):
* WebKitSupport/InRegionScrollableArea.h:
(InRegionScrollableArea):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@119679 268f45cc-cd09-0410-ab3c-d52691b4dbfc