Flesh out backend textures and rendertargets to support Direct3D.

Add GrD3DTextureInfo and GrD3DBackendSurfaceInfo, and uses those
to initialize GrBackendTexture and GrBackendRendertarget.

Bug: skia:9935
Change-Id: I4571c1b3aa8115250ff748deb8cf4a95f80f1237
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/278036
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
16 files changed