https://bugs.webkit.org/show_bug.cgi?id=99874

Reviewed by Levi Weintraub.

Source/WebCore:

RenderSVGRoot::paintReplaced() converts the container offsets to a relative transform,
but in doing so it ends up accumulating subpixel rounding deltas twice: first for
adjustedPaintOffset and second in localToParentTransform(). If coordinates are on
half-pixel boundaries, the 2x rounding delta yields a full pixel drift and we end up
painting at the wrong location.

This can be avoided by using localToBorderBoxTransform() directly, which (unlike
localToParentTransform()) doesn't perform rounding.

No new tests: existing pixel results cover this change after rebaseline.

* rendering/svg/RenderSVGRoot.cpp:
(WebCore::RenderSVGRoot::paintReplaced):

LayoutTests:

* platform/chromium-linux/svg/zoom/page/zoom-svg-float-border-padding-expected.png:
* platform/chromium-linux/svg/zoom/text/zoom-svg-float-border-padding-expected.png:
* platform/chromium-win/svg/custom/object-sizing-width-50p-height-75p-on-target-svg-absolute-expected.png:
* platform/chromium-win/svg/custom/object-sizing-width-50p-height-75p-on-target-svg-expected.png:
* platform/chromium/TestExpectations:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132377 268f45cc-cd09-0410-ab3c-d52691b4dbfc