[LayerTraceGenerator] fix mirrors and rel-z data

Now that we are using the new front end to
generate layers trace, we need to make a few fixes
so we can generate data that's parsable by winscope.

This means use a unique id instead of the layer id to
identify layers.

Test: presubmit
Fixes: 255901752
Change-Id: Ib30f7d8e2a5575803c455f947a1fd671095ea7e0