Rework GrSamplerParams to be more compact and use its own wrap mode enum.

The main change is to make GrSamplerParams smaller by making its enums have byte-sized underlying types. The rest is cosmetic.

Change-Id: Ib71ea50612d24619a85e463826c6b8dfb9b445e3
Reviewed-on: https://skia-review.googlesource.com/43200
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
diff --git a/tests/SRGBMipMapTest.cpp b/tests/SRGBMipMapTest.cpp
index a661d50..e10c248 100644
--- a/tests/SRGBMipMapTest.cpp
+++ b/tests/SRGBMipMapTest.cpp
@@ -145,9 +145,10 @@
     GrNoClip noClip;
     GrPaint paint;
     paint.setPorterDuffXPFactory(SkBlendMode::kSrc);
-    GrSamplerParams mipMapParams(SkShader::kRepeat_TileMode, GrSamplerParams::kMipMap_FilterMode);
-    paint.addColorTextureProcessor(std::move(proxy),
-                                   nullptr, SkMatrix::MakeScale(rtS), mipMapParams);
+    GrSamplerState mipMapSamplerState(GrSamplerState::WrapMode::kRepeat,
+                                      GrSamplerState::Filter::kMipMap);
+    paint.addColorTextureProcessor(std::move(proxy), nullptr, SkMatrix::MakeScale(rtS),
+                                   mipMapSamplerState);
 
     // 1) Draw texture to S32 surface (should generate/use sRGB mips)
     paint.setGammaCorrect(true);