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This reverts commit 6683995b.

Reason for revert: crbug.com/823235

Original change's description:
> Vaapi: Remove ConditionVariables and use PostTask
> 
> This CL removes the use of the ConditionVariables inside VaVDA and
> uses instead PostTask()ing. This removes blocking the worker
> thread, which allows for moving other tasks there, e.g. the
> Surface Blit (as done in the follow up WIP CL crrev.com/c/947341)
> 
> For all that goodness, this CL:
> 
> - Refactors the waiting logic that on ToT is spread between
>  GetCurrInputBuffer_Locked() and WaitForSurfaces_Locked() and
>  simplifies it in DecodeTask() itself.
> 
> - Moves the |curr_input_buffer_| filling logic in
>  GetCurrInputBuffer_Locked() into DecodeTask() proper.
> 
> - Reduces the scoped of the |lock_| in DecodeTask() (note that
>  |curr_input_buffer_| and |decode_| are only used on the decoder
>  thread -- added a .h comment).
> 
> Minor stuff: This CL also moves together the declaration of the
> related member vars |input_buffers_|, |curr_input_buffer_| and
> |available_va_surfaces_|
> 
> TEST=simplechrome+crosvideo (including seeks) on soraka, and
> v_d_a_unittest with h264, vp8, vp9 (with dcheck_always_on=true).
> 
> Bug: 717265
> Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: Ib167115dd2a4ebaeaea3ba3b5a205779d659f479
> Reviewed-on: https://chromium-review.googlesource.com/949283
> Commit-Queue: Miguel Casas <mcasas@chromium.org>
> Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#542955}

TBR=posciak@chromium.org,kcwu@chromium.org,mcasas@chromium.org,dcastagna@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 717265
Cq-Include-Trybots: luci.chromium.try:linux_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I62361a33067140eb42112ccf7613136137bc30e2
Reviewed-on: https://chromium-review.googlesource.com/967967
Commit-Queue: Pawel Osciak <posciak@chromium.org>
Reviewed-by: Pawel Osciak <posciak@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544014}