Temporary fix to allow Invoke() calls for VP8 HW encoder and decoder.
Temporary fix to allow Invoke() calls for VP8 HW encoder and decoder.

BUG=
R=jiayl@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/24849004

Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: 46ffc7087860789ddd2a794bfc1949e26ed3152b

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