[Graphite] Fix Dawn NMOF compressed texture GM.

This fixes crash caused by disabling dawn validation.

Change-Id: I88fee4e4682bebb34de49dc54e90d484f74507e2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/944096
Reviewed-by: Robert Phillips <[email protected]>
Commit-Queue: Greg Daniel <[email protected]>

gm/compressed_textures.cpp

@@ -266,10 +266,20 @@ class CompressedTexturesGM : public skiagm::GM {
             return DrawResult::kSkip;
         }
 
-        if (dContext &&
-            dContext->backend() == GrBackendApi::kDirect3D && fType == Type::kNonMultipleOfFour) {
-            // skbug.com/10541 - Are non-multiple-of-four BC1 textures supported in D3D?
-            return DrawResult::kSkip;
+        if (fType == Type::kNonMultipleOfFour) {
+            if (dContext && dContext->backend() == GrBackendApi::kDirect3D) {
+                // skbug.com/10541 - Are non-multiple-of-four BC1 textures supported in D3D?
+                return DrawResult::kSkip;
+            }
+#if defined(SK_GRAPHITE)
+            skgpu::graphite::Recorder* recorder = canvas->recorder();
+            if (recorder && recorder->backend() == skgpu::BackendApi::kDawn) {
+                // Dawn does not support non-multiple-of-four textures at all. For the same reason
+                // we can't support it on older D3D devices above, neither can Dawn. However, Dawn
+                // disables support for all devices to keep functionality uniform.
+                return DrawResult::kSkip;
+            }
+#endif
         }
 
         fOpaqueETC2Image = make_compressed_image(canvas, fImgDimensions,