Automatic update from web-platform-tests
Add frameType to RTCEncodedVideoFrameMetadata

Add a field specifying if a frame is a key or delta frame to the
RTC encoded frame metadata. Without this,
encodedFrame.setMetadata(encodedFrame.getMetadata()) would reset the
frame type in the header to "kEmptyFrame", causing it to be dropped
before being sent on a PeerConnection, making it hard to test
setMetadata().

Guarded by the same feature as the rest of this additional metadata:
RTCEncodedVideoFrameAdditionalMetadata.

Bug: webrtc:14709
Change-Id: Id93622dc7488f04900debff450689113fe757840
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4181178


Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Tony Herre <toprice@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1097421}

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wpt-commits: 672d747e92e68a55697fbeb69f8f9c14e2ebdf29
wpt-pr: 38164