jbauch e03ac51aa1 Implement NullVideoDecoder to avoid crash on unsupported decoders.
There is a use case with external codec factories that only support
encoding but not decoding for a given type. This leads to a crash
due to null being registered as codec (after a DCHECK).

This CL adds a NullVideoDecoder that is used instead of the null to
not crash but log to LS_ERROR.

BUG=webrtc:5249

Review URL: https://codereview.webrtc.org/1657023002

Cr-Commit-Position: refs/heads/master@{#11475}
2016-02-03 13:51:56 +00:00
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Name: WebRTC
URL: http://www.webrtc.org
Version: 90
License: BSD
License File: LICENSE

Description:
WebRTC provides real time voice and video processing
functionality to enable the implementation of 
PeerConnection/MediaStream.

Third party code used in this project is described 
in the file LICENSE_THIRD_PARTY.