https://bugs.webkit.org/show_bug.cgi?id=112061

Patch by Genevieve Mak <gmak@rim.com> on 2013-03-11
Reviewed by Rob Buis.

Internally reviewed by Mike Fenton and Jakob Petsovits.
PR #278490

Refactor the code in InRegionScroller so that we can add a method to find
the InRegionScrollableArea for a text selection.

* Api/InRegionScroller.cpp:
(BlackBerry::WebKit::InRegionScrollerPrivate::clipToRect):
    - Pull out recursive clipping code into its own function.
(WebKit):
(BlackBerry::WebKit::InRegionScrollerPrivate::calculateInRegionScrollableAreasForPoint):
(BlackBerry::WebKit::InRegionScrollerPrivate::firstScrollableInRegionForNode):
    - This new method allows us to get just the first scrollable region instead of looking
      for more nested ones. We may want to refactor in the future because some of the code is
      very similar to calculateInRegionScrollableAreasForPoint.
(BlackBerry::WebKit::InRegionScrollerPrivate::clipAndCreateInRegionScrollableArea):
    - Add a convenience method for the previous function
* Api/InRegionScroller.h:
(WebKit):
* Api/InRegionScroller_p.h:
(InRegionScrollerPrivate):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@145415 268f45cc-cd09-0410-ab3c-d52691b4dbfc