[webauthn] Wire signal methods client capabilities
Wire signal* client capabilities. These depend on a blink feature, so
they are added on the renderer after the browser has returned its
computed capabilities. conditionalCreate will also depend on a blink
feature so it gets moved too.
Add a WPT for basic testing.
https://w3c.github.io/webauthn/#dom-clientcapability-signalallacceptedcredentials
Bug: 361751877, 360327828
Change-Id: Ib52d6ea941b6de09e7d298c3ea3cef9b75f8778f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5859758
Auto-Submit: Nina Satragno nsatragno@chromium.org
Commit-Queue: Nina Satragno nsatragno@chromium.org
Reviewed-by: Andrii Natiahlyi natiahlyi@google.com
Cr-Commit-Position: refs/heads/main@{#1356475}