Add new traces.

Updates included:
- Adding traces from a few games and one top app (Angry Birds2, Candy Crush,
  Pubg, Google Photos).
- Change the dumps directory to traces to use a better name.
- Add new traces to TraceBenchmark.cpp.
- Add a TRACES file that includes information about how the trace files
  were collected.

Test: Unit tests pass.
Test: Ran the trace benchmarks.

Change-Id: I8d60db23cf78dd31977bb81d29749c06e1df354d
15 files changed