Allow multiple entities to await frame
Allow multiple entities to await frame

Triggered by a comment on https://crrev.com/c/2919755.

Bug: chromium:1213943
Change-Id: I9d4c9ac9088aaf02df202d8e085dfe0c362e7983
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2944906
Commit-Queue: Sigurd Schneider <f04d242e109628a27a0f75fd49a87722bcf291fd@chromium.org>
Reviewed-by: Wolfgang Beyer <573aa99bb19da47d816981118f95c945310dd3f4@chromium.org>

ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend,ChromeDevTools/devtools-frontend