https://bugs.webkit.org/show_bug.cgi?id=106125
<rdar://problem/12922720> Text in iframe is clipped while printing

Reviewed by Simon Fraser.

Added new tests in fast/multicol and fast/region.

Source/WebCore: 

* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::clampToStartAndEndRegions):
Don't clamp when the RenderView is the containing block of an object in a RenderFlowThread.

* rendering/RenderObject.cpp:
(WebCore::RenderObject::containerForRepaint):
Don't attempt any repaint container antics when we're in a seamless iframe, since the ancestor
document will actually do the handoff into the flow thread.

* rendering/RenderView.cpp:
(WebCore::enclosingSeamlessRenderer):
Heper function to test for an enclosing seamless iframe.
        
(WebCore::RenderView::addChild):
Subclass addChild on RenderView to properly set the inRenderFlowThread state for a seamless
child document so thta it will check regions.

(WebCore::RenderView::initializeLayoutState):
New helper method for setting up the initial layout state of a RenderView. If inside a seamless
paginated ancestor, set up the appropriate pagination information so the child document
knows about it. This method will expand to inherit info about line grids and exclusions eventually
also.

(WebCore::RenderView::layout):
Now calls initializeLayoutState to set up the layout state.

* rendering/RenderView.h:
(WebCore::RenderView::pageLogicalHeight):
(WebCore::RenderView::setPageLogicalHeight):
(RenderView):
Fix the type of the page logical height methods to be LayoutUnit instead of unsigned.

LayoutTests: 

* fast/multicol/resources/ipad.jpg: Added.
* fast/multicol/resources/seamless.html: Added.
* fast/multicol/seamless-flowed-through-columns-expected.html: Added.
* fast/multicol/seamless-flowed-through-columns.html: Added.
* fast/regions/resources/ipad.jpg: Added.
* fast/regions/resources/seamless.html: Added.
* fast/regions/seamless-iframe-flowed-into-regions-expected.html: Added.
* fast/regions/seamless-iframe-flowed-into-regions.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@143256 268f45cc-cd09-0410-ab3c-d52691b4dbfc