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/GrFragmentProcessor.cpp b/src/gpu/GrFragmentProcessor.cpp
index 6760aa7..e8d549f 100644
--- a/src/gpu/GrFragmentProcessor.cpp
+++ b/src/gpu/GrFragmentProcessor.cpp
@@ -413,9 +413,8 @@
 ///////////////////////////////////////////////////////////////////////////////////////////////////
 
 GrFragmentProcessor::TextureSampler::TextureSampler(GrSurfaceProxyView view,
-                                                    const GrSamplerState& samplerState)
-        : fView(std::move(view))
-        , fSamplerState(samplerState) {
+                                                    GrSamplerState samplerState)
+        : fView(std::move(view)), fSamplerState(samplerState) {
     GrSurfaceProxy* proxy = this->proxy();
     fSamplerState.setFilterMode(
             SkTMin(samplerState.filter(),
@@ -423,7 +422,7 @@
 }
 
 GrFragmentProcessor::TextureSampler::TextureSampler(sk_sp<GrSurfaceProxy> proxy,
-                                                    const GrSamplerState& samplerState) {
+                                                    GrSamplerState samplerState) {
     SkASSERT(proxy->asTextureProxy());
     GrSurfaceOrigin origin = proxy->origin();
     GrSwizzle swizzle = proxy->textureSwizzle();
@@ -438,7 +437,7 @@
 
 #if GR_TEST_UTILS
 void GrFragmentProcessor::TextureSampler::set(GrSurfaceProxyView view,
-                                              const GrSamplerState& samplerState) {
+                                              GrSamplerState samplerState) {
     SkASSERT(view.proxy()->asTextureProxy());
     fView = std::move(view);
     fSamplerState = samplerState;