In this CL:
- Added FrameObject::is_keyframe() convinience function.
- Moved logic to request keyframes on decoding error from VideoReceived to
VideoReceiveStream.
- Added keyframe_required as a parameter to FrameBuffer::NextFrame.
BUG=webrtc:8074
Review-Url: https://codereview.webrtc.org/2993793002
Cr-Commit-Position: refs/heads/master@{#19280}