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/gl/GrGLProgram.cpp b/src/gpu/gl/GrGLProgram.cpp
index 23442c5..fa61a54 100644
--- a/src/gpu/gl/GrGLProgram.cpp
+++ b/src/gpu/gl/GrGLProgram.cpp
@@ -100,7 +100,7 @@
 
     fXferProcessor->setData(fProgramDataManager, xp, dstTexture, offset);
     if (dstTexture) {
-        fGpu->bindTexture(nextTexSamplerIdx++, GrSamplerState::ClampNearest(),
+        fGpu->bindTexture(nextTexSamplerIdx++, GrSamplerState::Filter::kNearest,
                           programInfo.pipeline().dstProxyView().swizzle(),
                           static_cast<GrGLTexture*>(dstTexture));
     }