https://bugs.webkit.org/show_bug.cgi?id=36798

Reviewed by Dave Hyatt.

Fixed to the iframe flattening code so that the iframes on
http://www.samisite.com/test-csb2nf/id43.htm are actually
flattened.

Covered by current tests.

* page/FrameView.cpp: Propagate contents changes of iframes
and subframes in framesets to the parent so that it is relayouted
(WebCore::FrameView::setContentsSize):
(WebCore::FrameView::adjustViewSize):
(WebCore::FrameView::scheduleRelayout):
* rendering/RenderPart.cpp: HTMLIFrameElement do not inherit from
HTMLFrameElement, but HTMLFrameElementBase, correct cast. Correct
the use of inset border values. Avoid a sometimes unnecessary
relayout.
(WebCore::RenderPart::layoutWithFlattening):
* rendering/RenderPartObject.cpp: Make the calcHeight and calcWidth
return the right values, considering scrolling and fixed width/height
(WebCore::RenderPartObject::flattenFrame):
(WebCore::RenderPartObject::calcHeight):
(WebCore::RenderPartObject::calcWidth):
(WebCore::RenderPartObject::layout):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@57080 268f45cc-cd09-0410-ab3c-d52691b4dbfc