Add OWNERS for skia_paint_util*.

skia_paint_util* were split out from skia_util* last year.  Copy danakj@ as
owner since that's how skia_util* are set up.

Bug: none
Change-Id: I3bc5486932f0a7acfda1530f7b8ff5a85b71397c
Reviewed-on: https://chromium-review.googlesource.com/1149455Reviewed-by: Michael Wasserman <msw@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577954}

ui/gfx/OWNERS

@@ -22,6 +22,7 @@ per-file interpolated_transform*=vollick@chromium.org
 
 # Skia geometry helpers.
 per-file skia_util*=danakj@chromium.org
+per-file skia_paint_util*=danakj@chromium.org
 
 # GPU memory buffer and GpuFence interfaces.
 per-file gpu_fence*=reveman@chromium.org