Merge "Add parameter for exposing a dummy seekmap." into rvc-dev am: db853ad3 am: ac2660f3 am: 969061d1

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

Change-Id: I7649560054dffd40e4641ef39c18adb68018c86e