Add WebDX feature mapping for quotes

This CL should have no user-visible behavior changes.

Change-Id: I3efe07c47f01f3f0350647226393762ad238f241
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6008884
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1381096}

Author: kojiishi

css/css-content/WEB_FEATURES.yml

@@ -0,0 +1,4 @@
+features:
+- name: quotes
+  files:
+  - quotes-*