Add sample count field to GrD3DTextureResourceInfo.

Remove separate constructor arg from GrBackendRenderTarget.

Add appropriate checks in onWrap functions in GrD3DGpu to limit to
previous functionality.

Bug: skia:9832

Cq-Include-Trybots: luci.skia.skia.primary:Test-Win10-MSVC-Golo-GPU-QuadroP400-x86_64-Debug-All-Direct3D,Test-Win10-Clang-ShuttleA-GPU-RadeonHD7770-x86_64-Debug-All-Direct3D
Change-Id: Ieba398d4bc00d18fdb0adffcda81f1a166db24b3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/320757
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/RELEASE_NOTES.txt b/RELEASE_NOTES.txt
index 54e50a2..17fc6e7 100644
--- a/RELEASE_NOTES.txt
+++ b/RELEASE_NOTES.txt
@@ -11,7 +11,11 @@
 
   * GrVkImageInfo now has a field for sample count. GrBackendRenderTarget constructor
     that took both a GrVkImageInfo and separate sample count is deprecated. Use the
-    version without sample count instead.
+    version without sample count instead. Similarly, GrD3DTextureResourceInfo now
+    has a sample count field and GrBackendRenderTarget no longer takes a separate
+    sample count for Direct3D.
+    https://review.skia.org/320262
+    https://review.skia.org/320757
 
   * Added deprecation warning for Metal support on MacOS 10.13, iOS 8.3, and older.
     https://review.skia.org/320260