transforms should affect scrolling

Reviewed by Dave Hyatt.

This patch causes topmostPosition, lowestPosition, 
leftmostPosition, and rightmostPosition to take transforms into 
account.

Compute the topmost/lowest/leftmost/rightmost position without 
factoring in the block's transform until the end.
* rendering/RenderBlock.cpp:
(WebCore::RenderBlock::topmostPosition):
(WebCore::RenderBlock::lowestPosition):
(WebCore::RenderBlock::rightmostPosition):
(WebCore::RenderBlock::leftmostPosition):
* rendering/RenderBlock.h:

transformedFrameRect() returns the frameRect() transformed to the 
layer's transform. applyLayerTransformToRect() does the same thing 
for the input rect.
* rendering/RenderBox.cpp:
(WebCore::RenderBox::applyLayerTransformToRect):
(WebCore::RenderBox::transformedFrameRect):
(WebCore::RenderBox::topmostPosition):
(WebCore::RenderBox::lowestPosition):
(WebCore::RenderBox::rightmostPosition):
(WebCore::RenderBox::leftmostPosition):
* rendering/RenderBox.h:
* rendering/RenderMedia.cpp:
(WebCore::RenderMedia::topmostPosition):
(WebCore::RenderMedia::lowestPosition):
(WebCore::RenderMedia::rightmostPosition):
(WebCore::RenderMedia::leftmostPosition):
* rendering/RenderMedia.h:
* rendering/RenderTableSection.cpp:
(WebCore::RenderTableSection::topmostPosition):
(WebCore::RenderTableSection::lowestPosition):
(WebCore::RenderTableSection::rightmostPosition):
(WebCore::RenderTableSection::leftmostPosition):
* rendering/RenderTableSection.h:

LayoutTests: New tests and updated results for https://bugs.webkit.org/show_bug.cgi?id=47514 
CSS transforms should affect scrolling

Reviewed by Dave Hyatt.

New tests.
* fast/transforms/rotated-transform-affects-scrolling-1.html: Added.
* fast/transforms/rotated-transform-affects-scrolling-2.html: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70170 268f45cc-cd09-0410-ab3c-d52691b4dbfc