Implement GrD3DGpu::onReadPixels and GrD3DGpu::onWritePixels.

* Add resource copy routines to command list
* Be sure to release resources from command list

Change-Id: I174c5a026d5e2289e6db56215b0d140c19ccf39e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/284156
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
6 files changed