Simplify view getters on GrTextureProducer.

The only thing that affects the view returned is whether it ought to
be MIP mapped or not. So don't take a whole GrSamplerState.

The view() function won't ever change the colortype so just query
GrTextureProducer rather than having view() return a tuple.

The rest is transitively reaching through callers and callees of
GrTextureProducer::view() to only pass filter or GrMipMapped instead of
GrSamplerState. Also, some params that indicate whether MIPs are
requested are changed from bool to GrMipMapped. And some minor style
stuff (mainly de-yoda-ifying GrMipMapped checks, using
GrSurfaceProxyView operator bool()).

Change-Id: Ia184aa793cf51d42642ea3bb0521ce06da2efb10
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274205
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrImageTextureMaker.h b/src/gpu/GrImageTextureMaker.h
index 908e232..bd1aee7 100644
--- a/src/gpu/GrImageTextureMaker.h
+++ b/src/gpu/GrImageTextureMaker.h
@@ -22,7 +22,7 @@
                         SkImage::CachingHint chint, bool useDecal = false);
 
 private:
-    GrSurfaceProxyView refOriginalTextureProxyView(bool willBeMipped) override;
+    GrSurfaceProxyView refOriginalTextureProxyView(GrMipMapped) override;
 
     const SkImage_Lazy*     fImage;
     GrUniqueKey             fOriginalKey;
@@ -48,7 +48,7 @@
     bool hasMixedResolutions() const override { return true; }
 
 private:
-    GrSurfaceProxyView refOriginalTextureProxyView(bool willBeMipped) override;
+    GrSurfaceProxyView refOriginalTextureProxyView(GrMipMapped) override;
 
     const SkImage_GpuYUVA*  fImage;
     GrUniqueKey             fOriginalKey;