CHROMIUM: Refactor: Added FrameSpan class

BUG=b:220200707
TEST=build and run glxgears on x86

(cherry-picked from commit f41a37cf93e323bb0c2f1e2f332fa7d8be7366f8)

Change-Id: Ie5eaad4458e6ed15b62167d8eb91bb33e78d414c
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/apitrace/+/3551800
Reviewed-by: Ilja Friedel <ihf@chromium.org>
Commit-Queue: Po-Hsien Wang <pwang@chromium.org>
Tested-by: Po-Hsien Wang <pwang@chromium.org>
Auto-Submit: Po-Hsien Wang <pwang@chromium.org>
3 files changed