RTCDataChannel: Add support for the Blob type. (#47406)
This enables support for both sending Blobs using RTCDataChannel.send()
and received Blobs in the 'MessageEvent' data member by setting the
'binaryType' field to "blob".
Bug: webrtc:2276, chromium:41370769
Change-Id: I0f820d1992c9270c5ea6dc7ef67554e350780cc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3110559
Reviewed-by: Guido Urdaneta guidou@chromium.org
Auto-Submit: Florent Castelli orphis@chromium.org
Commit-Queue: Guido Urdaneta guidou@chromium.org
Cr-Commit-Position: refs/heads/main@{#1335968}
Co-authored-by: Florent Castelli orphis@chromium.org