media: Add DefaultMediaPermission.

Also pass MediaPermission to ProxyDecryptor, in preparation for triggering
user prompt from ProxyDecryptor for prefixed EME implementation.

TBR=jam@chromium.org,aa@chromium.org
BUG=446263

Review URL: https://codereview.chromium.org/887873003

Cr-Commit-Position: refs/heads/master@{#314082}


CrOS-Libchrome-Original-Commit: 60b430a11d662a93795cef0fd137cb7018172ab9
4 files changed
tree: dee91da204e76da5f50f1aa1fe8ba4935c089487
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/