Add options to pin and jump to latest log message

Test: Enable pin (clicking on pin icon) and move around in timeline – the last visible log message should always be the latest one. Disable pin and move around in the timline – the protolog should not change which messages are visible. Scroll in protolog and then click on jump to latest button – latest log message should be visible.
Change-Id: Ie9c0e5dd04356e2702097bbfd8c164243512da5f
1 file changed