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/image/SkImage_GpuBase.cpp b/src/image/SkImage_GpuBase.cpp
index 7bd05ba..51a0e01 100644
--- a/src/image/SkImage_GpuBase.cpp
+++ b/src/image/SkImage_GpuBase.cpp
@@ -187,7 +187,7 @@
 }
 
 GrSurfaceProxyView SkImage_GpuBase::refView(GrRecordingContext* context,
-                                            GrSamplerState params) const {
+                                            GrMipMapped mipMapped) const {
     if (!context || !fContext->priv().matches(context)) {
         SkASSERT(0);
         return {};
@@ -195,7 +195,7 @@
 
     GrTextureAdjuster adjuster(fContext.get(), *this->view(context), this->imageInfo().colorInfo(),
                                this->uniqueID());
-    return adjuster.viewForParams(params);
+    return adjuster.view(mipMapped);
 }
 
 GrBackendTexture SkImage_GpuBase::onGetBackendTexture(bool flushPendingGrContextIO,