GitLab

This CL contains some (unused) classes that form the basis for the
media local learning experiment.

These are in the media::learning namespace, rather than just media,
for two reasons:
  - Some of the names ("Value") are pretty generic.
  - I'd like to move it to components/ if it's generally useful.

Bug: 895929
Change-Id: I92f2f23672d0256449b39da4d32c6b4e1595c5c8
Reviewed-on: https://chromium-review.googlesource.com/c/1283992
Commit-Queue: Frank Liberato <liberato@chromium.org>
Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600847}