Traces with real-to-elapsed time offset

Add real_to_elapsed_time_offset_nanos field to protobuf traces:
- SF layers
- SF transactions

Bug: 235196806
Test: record and view SF + transaction traces with winscope
Change-Id: I5f4d2a2b4e2ceaacf75c43d01f866fe1e2b76532
4 files changed