move SkArenaAlloc reset to its own class
SkArenaAlloc has three fields that are used only for reset. Make a
subclass called SkArenaAllocWithReset which has the three
fields, and has the reset functionality.
An example of a reset() that is used instead of using a better scope
is PathOpsAngleAfter in PathOpsAngleTest.cpp.
Change-Id: Ie1965d128dfb7df9e022f4d18460d3f75f33e1a6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/307348
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Herb Derby <herb@google.com>
13 files changed