Add support for YUV4MPEG file reading to tools files. (Minor fix).
Add support for YUV4MPEG file reading to tools files. (Minor fix).


Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 4375e1acbb4462618e2a17c8377647b7feeac390

sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc,sippet/webrtc