Support subpixel layout of borders.
This cl implements subpixel layout of borders. Painting of subpixel borders now uses rounding to nearest CSS pixel, and is aligned with Edge. Handling of device pixel ratios > 1 isn't implemented here, and is better covered in a separate task. This does not implement subpixel borders for tables, as that interacts with table layout width calculations, which would also need to be adapted to subpixels. Again, that's better dealt with in a separate task. A number of test cases had to be rebaselined, due to minor changes in layout and/or painting. Most of these changes appear in tests that uses zooming, and implicitly have fractional borders. svg/zoom/page/zoom-replaced-intrinsic-ratio-001.htm now looks a bit broken, but that's due to an unrelated issue with aspect ratio and subpixels (in LayoutPart, if I recall correctly). BUG=227192 CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2 Review-Url: https://codereview.chromium.org/2640143005 Cr-Commit-Position: refs/heads/master@{#449943}
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