performance-log-expand.py decodes a delta-encoded performance log
by expanding the deltas, producing a log where each sample (and
other relevant elements) contain complete information.  Note that
the structure of expanded logs is identical to that of delta-
encoded logs, the expanded log simply has no deltas.

performance-log-resolve.py resolves symbol information in
backtraces.  The logs produced by GIMP only specify the program
counter at each stack frame, providing an address-map to map
program-counter addresses to actual symbols separately.  This tool
looks up each program-counter address in the address map,
incorporating the relevant symbol information directly into the
backtrace.

Both tools read their input from STDIN, and write their output to
STDOUT, and can be chained in a pipeline (with
gimp-performance-log-expand.py appearing first).

Note that these tools require Python 3.