D3D11: Rename TextureStorage swizzle invalidation. Since we'll also be storing a cache of depth textures as well as swizzle info, generalize the invalidation methods. BUG=angleproject:1493 BUG=chromium:638323 Change-Id: I8fef049b01c81483fcf28196866a22d5cfed32a1 Reviewed-on: https://chromium-review.googlesource.com/380036 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>