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This CL adds a MediaLog to VideoEncoder and uses it to surface basic
properties. For now, it uses the VideoDecoder MediaLog properties to
surface encoder name, because changes to the Devtools code would and
the creation of new properties would be required to surface it as
an encoder.

Bug: 1148576
Change-Id: Ib9b0188421b08071672f49aead4cc87bd7d55d69
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2535561Reviewed-by: Eugene Zemtsov <eugene@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827508}