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This CL mirrors the changes landed in
acbd2eae, and exposes VideoEncoder to
workers.

The changes in this CL rely on the conclusions from the previous CL.
Notably, there is a need for a synchronous wait when getting the GPU
factories due to some threading issues, and there is no support for
logging from workers.

Bug: 1094169
Change-Id: I2da6cdb2afd7b80e342268cbbfcb00fea64ad37f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2578002
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835551}