flags: assign ui-slow-animations

This flag is used mainly by the ChromeOS UI and graphics teams to debug
animation issues. This change assigns it to members of that team and marks it to
never expire.

Bug: None
Change-Id: I18053c6ddccc959f27f9d03a339f3553e90664c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1570489
Auto-Submit: Elly Fong-Jones <ellyjones@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#652139}

chrome/browser/flag-metadata.json

@@ -2965,8 +2965,10 @@
   },
   {
     "name": "ui-slow-animations",
-    // "owners": [ "your-team" ],
-    "expiry_milestone": 76
+    "owners": [ "oshima", "sammiequon", "afakhry" ],
+    // This flag is used for in-the-field debugging of animation issues on
+    // Chrome OS.
+    "expiry_milestone": -1
   },
   {
     "name": "unfiltered-bluetooth-devices",

chrome/browser/flag-never-expire-list.json

@@ -58,6 +58,7 @@
   "tint-gl-composited-content",
   "translate-android-manual-trigger",
   "ui-disable-partial-swap",
+  "ui-slow-animations",
   "update-menu-item-custom-summary",
   "use-angle"
 ]