[skottie] Fix float->int overflow

We do test for and catch int overflows, but after casting -- which is
enough to trip clusterfuzz.

Refactor to catch upfront.

Bug: b/200722666
Bug: b/200663331
Bug: b/200662108
Change-Id: I26da4b1ca21ad0bc34384e957a30211402219841
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/493018
Commit-Queue: Florin Malita <fmalita@chromium.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
1 file changed