Validate allocation size in GrBufferAllocPool using SkSafeMath.

Bug: skia:895362
Change-Id: I3a49bcd899760d33789a9df17a0a5f3556c879a5
Reviewed-on: https://skia-review.googlesource.com/c/163485
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
1 file changed