Peter Boström f812e45d8f Handle InitDecode and reset in fallback decoder.
Makes sure video decoder software fallback handles InitDecode()
failures, and properly releases the pointer after ::Release() so that
another decode failure will properly reinitialize the decoder.

Also makes sure to not call Decode() without a previous InitDecode()
succeeding.

BUG=webrtc:7154
R=noahric@chromium.org, sophiechang@chromium.org

Review-Url: https://codereview.webrtc.org/2690183004 .
Cr-Commit-Position: refs/heads/master@{#16594}
2017-02-13 22:11:08 +00:00
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