- When switching to a new consumer, also invalidate the handler to
clean up references held by that handler
- Also make sure that we calculate the task index used for logging
prior to starting the task view since the handler can be invalidated
between starting the activity and the callback happening
Bug: 185909226
Test: Presubmit
Change-Id: I20e06b5a6b31a5e242c6fc840bf4f215797eb12c
Winson Chung
4df3b23225