perfetto-ui: Fix reload
perfetto-ui: Fix reload

The engine worker was dropping mesages sent before initialization which
was causing the controller to hang forever. Fix this by queueing early
messages then dispatching them at initialization.

Bug: 123190839
Change-Id: Iccf63e5709d1e4b72cbcac664cfb05004f6bc370
google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto,google/perfetto