Collect data for blocked toasts due to rate limiting.

We're using compat change that will report that the change was accessed
only when a toast was blocked due to rate limting. We can use these
stats to observe how much of an impact this feature has and on which
apps.

Test: manually observed that the log message appears
Bug: 174840628
Change-Id: I0cc0c76f48b392cbdaf87363248a683ae3150cf3