Merge "Don't call 'getShortDescription' when tracing is not enabled" into main

    @SuppressWarnings("unused")

    @UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.R, trackingBug = 170729553)

    private void dispatchInputEvent(int seq, InputEvent event) {

        Trace.traceBegin(Trace.TRACE_TAG_INPUT, "dispatchInputEvent " + getShortDescription(event));

        if (Trace.isTagEnabled(Trace.TRACE_TAG_INPUT)) {

            // This 'if' block is an optimization - without it, 'getShortDescription' will be

            // called unconditionally, which is expensive.

            Trace.traceBegin(Trace.TRACE_TAG_INPUT,

                    "dispatchInputEvent " + getShortDescription(event));

        }

        mSeqMap.put(event.getSequenceNumber(), seq);

        onInputEvent(event);

        // If tracing is not enabled, `traceEnd` is a no-op (so we don't need to guard it with 'if')

        Trace.traceEnd(Trace.TRACE_TAG_INPUT);

    }