Texture: Ignore buffer contents changed events. Texture doesn't need to care when its attached buffer gets different contents via a SubData call. This CL updates the BufferVk logic to ensure that SubData calls trigger a storage changed notification when there's a new storage, and otherwise Texture can ignore SubData calls. Will make it easier to split "contents" changed notifications to their own event, for optimizing Vertex Buffer updates. Bug: angleproject:6371 Change-Id: I4f15ad3ad2da5d838bd51fb065184b7344b188d8 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3181562 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>