Incorporate sample count into RTC fallback color type.

Formats can be renderable but not support MSAA.

Change-Id: I33fd295cce0b4b11a0c132c40a85fc7a7d4973b5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/281477
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrClipStackClip.cpp b/src/gpu/GrClipStackClip.cpp
index ec6c648..63409c2 100644
--- a/src/gpu/GrClipStackClip.cpp
+++ b/src/gpu/GrClipStackClip.cpp
@@ -355,7 +355,8 @@
 static constexpr auto kMaskOrigin = kTopLeft_GrSurfaceOrigin;
 
 static GrSurfaceProxyView find_mask(GrProxyProvider* provider, const GrUniqueKey& key) {
-    return provider->findCachedProxyWithColorTypeFallback(key, kMaskOrigin, GrColorType::kAlpha_8);
+    return provider->findCachedProxyWithColorTypeFallback(key, kMaskOrigin, GrColorType::kAlpha_8,
+                                                          1);
 }
 
 GrSurfaceProxyView GrClipStackClip::createAlphaClipMask(GrRecordingContext* context,