when having -webkit-background-blending applied. Turns out the problem was
the blending parameter not being passed to WebCore::CrossfadeGeneratedImage::draw

https://bugs.webkit.org/show_bug.cgi?id=126887

Patch by Mihai Tica <mitica@adobe.com> on 2014-01-20
Reviewed by Dirk Schulze.

Test: css3/compositing/background-blend-mode-crossfade-image.html

* platform/graphics/CrossfadeGeneratedImage.cpp:
(WebCore::CrossfadeGeneratedImage::draw): set blendMode on context.

LayoutTests: Reapply:
[CSS Background Blending] Background layer with -webkit-cross-fade doesn't blend
when having -webkit-background-blending applied. Tests now use SVG rects, instead
of circles.

https://bugs.webkit.org/show_bug.cgi?id=126887
Patch by Mihai Tica <mitica@adobe.com> on 2014-01-20
Reviewed by Dirk Schulze.

* css3/compositing/background-blend-mode-crossfade-image-expected.html:
* css3/compositing/background-blend-mode-crossfade-image.html:
* platform/efl/TestExpectations: Pass efl as blendMode is not implemented.
* platform/mac/TestExpectations: Mark added test as ImageOnlyFailure due to slight differences between the result and the blending formula.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@162348 268f45cc-cd09-0410-ab3c-d52691b4dbfc