Allow implicit conversion from GrSamplerState::Filter to GrSamplerState

constexprify GrSamplerState

pass/return GrSamplerState by value (it's 3 bytes).

Remove unused function from GrTexturePriv

Change-Id: Iffecd941500acf5653f01cc88b42ff1d45678b54
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263346
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrTextureAdjuster.cpp b/src/gpu/GrTextureAdjuster.cpp
index a024db1..529d33d 100644
--- a/src/gpu/GrTextureAdjuster.cpp
+++ b/src/gpu/GrTextureAdjuster.cpp
@@ -71,10 +71,9 @@
     return copy;
 }
 
-sk_sp<GrTextureProxy> GrTextureAdjuster::onRefTextureProxyForParams(
-        const GrSamplerState& params,
-        bool willBeMipped,
-        SkScalar scaleAdjust[2]) {
+sk_sp<GrTextureProxy> GrTextureAdjuster::onRefTextureProxyForParams(GrSamplerState params,
+                                                                    bool willBeMipped,
+                                                                    SkScalar scaleAdjust[2]) {
     sk_sp<GrTextureProxy> proxy = this->originalProxyRef();
     CopyParams copyParams;