Merge "Add parameter for exposing a dummy seekmap." into rvc-dev am: db853ad3 am: 3b14bf53 am: e3329f2b

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11712603

Change-Id: If39c4ab88d2b33775611bfa0258e8165cfe57390