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In webcodecs, VideoEncodeAcceleratorAdapter needs to call Flush method,
since the mojoVEA doesn't support IsFlushSupported, so the
VideoEncodeAcceleratorAdapter cannot really call the backendVEA Flush
even the backendVEA support Flush. This CL fix this issue.

Bug: 1128768, 1110279
Change-Id: I4853c2bd0e494cafdd806d183ab3d659ca542d7a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2389840Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Hirokazu Honda <hiroh@chromium.org>
Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Zhaoliang Ma <zhaoliang.ma@intel.com>
Cr-Commit-Position: refs/heads/master@{#827668}