Paginated views should restrict available height to column height
-and corresponding-
<rdar://problem/11152108>

Reviewed by Dan Bernstein.

Source/WebCore: 

Now that RenderViews can have columns, availableLogicalHeight needs to consider 
that column height, much like how availableLogicalWidth already considers column 
width.

availableLogicalHeight is newly virtual, like the already-virtual 
availableLogicalWidth.
* rendering/RenderBox.h:
(RenderBox):

Check with the columnHeight.
* rendering/RenderView.cpp:
(WebCore):
(WebCore::RenderView::availableLogicalHeight):
* rendering/RenderView.h:

setPagination now takes pageLength as an optional parameter. 
* testing/InternalSettings.cpp:
(WebCore::InternalSettings::setPagination):
* testing/InternalSettings.h:
(WebCore::InternalSettings::setPagination):
(InternalSettings):
* testing/InternalSettings.idl:
* testing/Internals.cpp:
(WebCore::Internals::setPagination):
* testing/Internals.h:
(WebCore::Internals::setPagination):
(Internals):
* testing/Internals.idl:

LayoutTests: 

New test.
* fast/multicol/resources/big-green.png: Added.
* fast/multicol/shrink-to-column-height-for-pagination.html: Added.
* platform/mac/fast/multicol/shrink-to-column-height-for-pagination-expected.png: Added.
* platform/mac/fast/multicol/shrink-to-column-height-for-pagination-expected.txt: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@122761 268f45cc-cd09-0410-ab3c-d52691b4dbfc