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This CL front-loads the configuration parsing and codec support
verification into the Configure() method. This means that and invalid
or unsupported config should immediately throw an exception, rather than
being reported in the error callback.

This CL also allows encoders to be re-configured.

Bug: 1116783, 1094166
Change-Id: I88df452cfa2a1b0fcfeb4da6c279665661d7380f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363711
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Reviewed-by: Chrome Cunningham <chcunningham@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800277}