[buganizer] Migrate DIR_METADATA for ash/

Migrate all metadata files for ash/ and mixins
used by metadata files under ash/.

Bug: chromium:1518875
Change-Id: I3e1aeb62ea437ced0f13a2fbaa117f71be8466f7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5198438
Reviewed-by: Maksim Ivanov <emaxx@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Jeff Yoon <jeffyoon@google.com>
Cr-Commit-Position: refs/heads/main@{#1247637}

diff --git a/services/media_session/COMMON_METADATA b/services/media_session/COMMON_METADATA
index 28cafbcc..643a8e1 100644
--- a/services/media_session/COMMON_METADATA
+++ b/services/media_session/COMMON_METADATA

@@ -1,4 +1,7 @@
-monorail {
+monorail: {
   component: "Internals>Media>Session"
 }
-team_email: "media-dev@chromium.org"
\ No newline at end of file
+team_email: "media-dev@chromium.org"
+buganizer_public: {
+  component_id: 1456217
+}