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This is a follow-up CL to handle requests made on the recording
service CL (https://crrev.com/c/2404145):
- The Record*() APIs of the service should provide the needed client,
  video capturer, and audio stream factory, instead of exposing APIs
  in the client so that anyone can bind to those capturers.
- The service is launched to handle video recording, and terminated
  once recording ends, and all the chunks have been sent.
- A GPU crash is handled by ending the recording.

BUG=1126586, 1147989, 1143411
TEST=Manually, existing tests.

Change-Id: I235cb1f9ee81dbbc42e21d0a222d32bcafa7a0fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536030Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828574}