Adds Skia Gold files owners

svenzheng@ and bsheedy@ works on the project. It should be easier for
them to be able to approve changes for these files.

Change-Id: Ie50a5ec2337801b2cb518d0e5d850d5a07f8aa9a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2508251Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Sven Zheng <svenzheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822740}

ui/base/test/OWNERS

@@ -7,4 +7,8 @@ tapted@chromium.org
 thakis@chromium.org
 
 # Clipboard
-per-file test_clipboard*=dcheng@chromium.org
+per-file test_clipboard*=dcheng@chromium.org
\ No newline at end of file
+
+# Skia Gold
+per-file skia_gold*=svenzheng@chromium.org
+per-file skia_gold*=bsheedy@chromium.org