Add DIR_METADATA files to //skia

Generate DIR_METADATA files and remove metadata from OWNERS files for //skia.

Bug: 1113033
Change-Id: I499666a82df15d1ebeb429643a9ef9ddd2faefea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451327Reviewed-by: Victor Costan <pwnall@chromium.org>
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Edward Lesmes <ehmaldonado@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814345}

skia/DIR_METADATA

+# Metadata information for this directory.
+#
+# For more information on DIR_METADATA files, see:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/README.md
+#
+# For the schema of this file, see Metadata message:
+#   https://source.chromium.org/chromium/infra/infra/+/master:go/src/infra/tools/dirmd/proto/dir_metadata.proto
+
+monorail {
+  component: "Internals>Skia"
+}
\ No newline at end of file

skia/OWNERS

@@ -18,5 +18,3 @@ thakis@chromium.org
 
 # For Fuchsia-specific changes:
 per-file *_fuchsia*=file://build/fuchsia/OWNERS
-
-# COMPONENT: Internals>Skia