Merge "Ignore apply input transaction for removed activity." into tm-qpr-dev

        SurfaceControl.Transaction inputSinkTransaction = null;

        for (int i = 0; i < mParticipants.size(); ++i) {

            final ActivityRecord ar = mParticipants.valueAt(i).asActivityRecord();

            if (ar == null || !ar.isVisible()) continue;

            if (ar == null || !ar.isVisible() || ar.getParent() == null) continue;

            if (inputSinkTransaction == null) {

                inputSinkTransaction = new SurfaceControl.Transaction();

            }