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Temporal and spatial layer encoding configuration has been
refused in RtcVideoEncoder (VEAClient for webrtc).
crrev.com/c/2131444 starts to propagate the configuration to
VEA so that each VEA judges if they are supported.
As VaapiVEA and V4L2VEA support neither temporal nor
spatial layer encoding currently, this CL modified their
Initialize() to fail if such mode is requested via the Config
parameters.

Bug: 1030199
Test: HW decoder and encoder is used in appr.tc on shyvana
Bug: vea test on shyvana
Bug: media_unittests --gtest_filter=VaapiVEA* on shyvana
Change-Id: Ic5501230e1d1f82bb20901915c264d1c67691061
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2132007Reviewed-by: Dan Sanders <sandersd@chromium.org>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: Hirokazu Honda <hiroh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758612}