Revert "Revert "Send multiple scheduler frame timelines."" This reverts commit caaa47d60b83670206dcd3c34382719b1f247ab5. Reason for revert: Fix the reverted CL in 2nd CL. Bug: 198192508 Bug: 204941507 Test: See 2nd CL. Change-Id: I15c693c2e0a82ef81a490319da11871bd74298b3