Using private inheritance is similar to having a class member,
except it's initialized before the next base class, SkTArray.
This lets us pass it to SkTArray's constructors.
I think we can make related changes (updating the various SkAlignedFoo,
not using them here, or not using them anywhere) independently.
... storage constructors made explicit at suggestion of GCC's -Wextra.
... now with explicit static_cast<STORAGE*>(this)
Change-Id: I665cf840e111da68f039416c9649ce328cc308d6
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/333146
Reviewed-by: John Stiles <johnstiles@google.com>
46f11c2aab