The fast/regions/scrolling/wheel-scroll-abspos.html layout test is failing since r180654 (http://trac.webkit.org/changeset/180654). This revision updates the test -expected files. The diff is the following https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r180999%20%286665%29/fast/regions/scrolling/wheel-scroll-abspos-diffs.html
The fast/regions/scrolling/wheel-scroll.html layout test is also failing. https://build.webkit.org/results/GTK%20Linux%2064-bit%20Release%20%28Tests%29/r181260%20%286803%29/fast/regions/scrolling/wheel-scroll-diffs.html
Created attachment 251728 [details] Patch
The result test were rebaselined finally at revision r183802 (http://trac.webkit.org/changeset/183802).