philipel 26b4804358 Request keyframes more frequently on stream start/decoding error.
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}
2017-08-09 10:33:59 +00:00
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