Merge 129370 - snapToSize rounds the incorrectly for negative locations

LayoutTests/platform/wincairo/Skipped

 #
 # Copyright (C) 2011 Brent Fulgham <bfulgham@webkit.org>. All rights reserved.
 # Copyright (C) 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:
 #
 # 1.  Redistributions of source code must retain the above copyright
 #     notice, this list of conditions and the following disclaimer. 
@@ skipping 2117 matching lines @@
 fast/sub-pixel/inline-block-with-margin.html
 fast/sub-pixel/inline-block-with-padding.html
 fast/sub-pixel/large-sizes.html
 fast/sub-pixel/layout-boxes-with-zoom.html
 fast/sub-pixel/position-right-aligns-with-container.html
 fast/sub-pixel/selection/selection-gaps-at-fractional-offsets.html
 fast/sub-pixel/size-of-box-with-zoom.html
 fast/sub-pixel/table-rows-no-gaps.html
 fast/sub-pixel/sub-pixel-accumulates-to-layers.html
 fast/sub-pixel/selection/selection-rect-in-sub-pixel-table.html
+fast/sub-pixel/snap-negative-location.html
 
 #Battery Status API is not implemented.
 batterystatus
 
 # Network Information API is not supported yet. http://webkit.org/b/73528
 networkinformation
 
 # Generate results for your platform http://webkit.org/b/85567
 fast/images/png-suite/test.html
 
 # UndoManager is not yet enabled.
 # https://bugs.webkit.org/show_bug.cgi?id=87908
 editing/undomanager
 
 # https://bugs.webkit.org/show_bug.cgi?id=86000
 http/tests/security/referrer-policy-redirect-link.html
 
 # Content Security Policy 1.1 (ENABLE_CSP_NEXT) is not enabled
 # https://bugs.webkit.org/show_bug.cgi?id=85558
 http/tests/security/contentSecurityPolicy/1.1
 
 # Skip tests in fast/text/shaping
 fast/text/shaping
 
 # ENABLE(WIDGET_REGION) is disabled
 fast/css/widget-region-parser.html
 
 # ENABLE(INPUT_TYPE_TIME_MULTIPLE_FIELDS) is disabled
 fast/forms/time-multiple-fields