https://bugs.webkit.org/show_bug.cgi?id=75741
<rdar://problem/9383222>

Reviewed by Simon Fraser.

The transformation from pattern space to user space should use the userToBase CTM,
not the current CTM.

Test: svg/custom/pattern-userSpaceOnUse-userToBaseTransform.xhtml

* platform/graphics/cg/GraphicsContextCG.cpp:
(WebCore::GraphicsContext::applyStrokePattern):
(WebCore::GraphicsContext::applyFillPattern):
(WebCore::GraphicsContext::getCTM):
* platform/graphics/cg/TransformationMatrixCG.cpp:
(WebCore::AffineTransform::AffineTransform): Add a AffineTransform(CGAffineTransform) constructor
* platform/graphics/transforms/AffineTransform.h:

Add a test that ensures that userSpaceOnUse patterns are rendered in the
correct orientation and location in both the accelerated compositing and
regular cases, as well as with SVG translation.

* platform/mac/svg/custom/pattern-userSpaceOnUse-userToBaseTransform-expected.png: Added.
* platform/mac/svg/custom/pattern-userSpaceOnUse-userToBaseTransform-expected.txt: Added.
* svg/custom/pattern-userSpaceOnUse-userToBaseTransform.xhtml: Added.



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@104356 268f45cc-cd09-0410-ab3c-d52691b4dbfc