https://bugs.webkit.org/show_bug.cgi?id=85555

Source/WTF: 

Reviewed by Eric Seidel.

Enabling sub-pixel layout on Chromium port.

* wtf/Platform.h:

LayoutTests: 

Patch by Levi Weintraub  <leviw@chromium.org> and Emil A Eklund <eae@chromium.org> on 2012-05-21
Reviewed by Eric Seidel.

Updating tests to handle sub-pixel layout, and updating chromium-linux expecations. Updated test
expectations for Chromium Linux and Mac are ready, but the diff is too large for Buzgilla's tiny
brain (>10MB).

* css1/units/rounding.html:
* fast/borders/border-radius-huge-assert.html:
* fast/css/zoom-in-length-round-trip.html:
* fast/dom/Document/CaretRangeFromPoint/hittest-relative-to-viewport.html:
* fast/dom/Window/webkitConvertPoint.html:
* fast/dom/elementFromPoint-relative-to-viewport.html:
* fast/events/clientXY-in-zoom-and-scroll.html:
* fast/events/document-elementFromPoint.html:
* fast/events/offsetX-offsetY.html:
* fast/multicol/break-properties.html:
* fast/multicol/vertical-lr/break-properties.html:
* fast/multicol/vertical-rl/break-properties.html:
* fast/regions/region-style-rule-specificity.html:
* fast/replaced/table-percent-height.html:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@117815 268f45cc-cd09-0410-ab3c-d52691b4dbfc