Narrow danakj ownership in gfx/

TBR=sky@chromium.org

Change-Id: I681f512b7fcb29cda09ee1771758917a50665c90
Reviewed-on: https://chromium-review.googlesource.com/830891Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524510}

ui/gfx/OWNERS

 # Font rendering and what not.
 asvitkine@chromium.org
 
-# Primitive graphics types (size, rect, vector ...)
-danakj@chromium.org
-
 # RenderText and related classes.
 msw@chromium.org
 
@@ -14,8 +11,13 @@ per-file screen*=oshima@chromium.org
 # Font-rendering configuration.
 per-file font_render_params*=derat@chromium.org
 
+# Canvas painting.
+per-file canvas*=danakj@chromium.org
+
 # Transform, interpolated transform and transform util.
+per-file transform*=danakj@chromium.org
 per-file transform*=vollick@chromium.org
+per-file interpolated_transform*=danakj@chromium.org
 per-file interpolated_transform*=vollick@chromium.org
 
 # GPU memory buffer and GpuFence interfaces.