Track Skia's Code size in Flutter

This creates a nice readable display, since Bloaty
doesn't allow filtering through the CLI.

Additionally, rename the flutter job to accurately
represent what settings it actually is (32 bit ARM built
with clang).

Bug: skia:
Change-Id: Iaed313caf43a31105adc8c85c545cc6cb2bcbe30
Reviewed-on: https://skia-review.googlesource.com/c/160920
Reviewed-by: Mike Klein <mtklein@google.com>
Reviewed-by: Eric Boren <borenet@google.com>
Commit-Queue: Kevin Lubick <kjlubick@google.com>
9 files changed