Merge "Use async callback for unfold overlay synchronization" into tm-dev am:...

            newRoot.relayout(params) { transaction ->

                val vsyncId = Choreographer.getSfInstance().vsyncId

                backgroundExecutor.execute {

                    // Apply the transaction that contains the first frame of the overlay

                    // synchronously and apply another empty transaction with

                    // 'vsyncId + 1' to make sure that it is actually displayed on

                    // the screen. The second transaction is necessary to remove the screen blocker

                    // (turn on the brightness) only when the content is actually visible as it

                // Apply the transaction that contains the first frame of the overlay and apply

                // another empty transaction with 'vsyncId + 1' to make sure that it is actually

                // displayed on the screen. The second transaction is necessary to remove the screen

                // blocker (turn on the brightness) only when the content is actually visible as it

                // might be presented only in the next frame.

                // See b/197538198

                    transaction.setFrameTimelineVsync(vsyncId).apply(/* sync */ true)

                    transaction.setFrameTimelineVsync(vsyncId + 1).apply(/* sync */ true)

                transaction

                    .setFrameTimelineVsync(vsyncId)

                    .apply()

                transaction.setFrameTimelineVsync(vsyncId + 1)

                    .addTransactionCommittedListener(backgroundExecutor) {

                        Trace.endAsyncSection("UnfoldLightRevealOverlayAnimation#relayout", 0)

                        callback.run()

                    }

                    .apply()

            }

        }