Add WebDX feature mapping for initial-letter
This CL should have no user-visible behavior changes.
Change-Id: Idbf3e08536f6a1aba3b477cfeed13b61fe557a2c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6008802
Commit-Queue: Takashi Toyoshima toyoshim@chromium.org
Auto-Submit: 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@{#1381088}