This reverts commit a4e71b9e7e59be21b98d63cf8cb676096d9c74b0.
Reason for revert: Breaking internal project
Original change's description:
> VCMGenericDecoder threading updates for all but Android.
>
> * All methods now have thread checks.
> * Variable access associated with thread checkers.
> * Remove need for |rtc::CriticalSection lock_|
>
> Since the android decoder is inherently asynchronous, and
> FrameBuffer2's decoder doesn't support posting tasks to it
> yet (for async decode completion), we need to tackle android
> separately. Once FrameBuffer2 gets changed to use a TaskQueue
> or ProcessThread, we can move Android over to delivering decoded
> frames on the right thread/queue and delete generic_decoder_android.*.
>
> Note: This is a subset of code that was previously reviewed here:
> - https://codereview.webrtc.org/2764573002/
>
> Bug: webrtc:7361, webrtc:8907, chromium:695438
> Change-Id: I118609dfa5c0f0180287d8c2b6d62987b7473c5c
> Reviewed-on: https://webrtc-review.googlesource.com/55060
> Commit-Queue: Tommi <tommi@webrtc.org>
> Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
> Cr-Commit-Position: refs/heads/master@{#22119}
TBR=sakal@webrtc.org,tommi@webrtc.org
Change-Id: I3afe4671f9d06bb4a2b17e4f14c21d79f773e067
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: webrtc:7361, webrtc:8907, chromium:695438
Reviewed-on: https://webrtc-review.googlesource.com/56282
Reviewed-by: Lu Liu <lliuu@webrtc.org>
Commit-Queue: Lu Liu <lliuu@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#22143}
352314adb8