This CL adds the start of the implementation of a SubresourceStorage<T>
container class that stores per-subresource state in a compressed
fashion. Only the getter methods and Update() modifying methods are
added because they are the first step necessary to test the behavior of
SubresourceStorage.
Subsequent CLs will:
- add the Merge() operation
- move the per-aspect storage to be inlined and avoid allocation of
mData and mLayerCompressed if possible
- use the container where applicable in dawn_native
- (maybe) move clear-state tracking in the backends as part of barrier
tracking
Bug: dawn:441
Change-Id: Ic93e5af16dd705b260424f05e4dc3e0c9f6fbd0a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/34464
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Ben Clayton <bclayton@google.com>
