Reland "Update FragmentProcessor TextureSampler to hold an GrSurfaceProxyView."

This reverts commit c5c024791bb7a587223b807e00ffba4a3eb5fdb7.

Reason for revert: Doh

Original change's description:
> Revert "Update FragmentProcessor TextureSampler to hold an GrSurfaceProxyView."
> 
> This reverts commit acf5929ae0addc5188117142fd3fb39828baa8d5.
> 
> Reason for revert: May be blocking Chrome roll
> Original change's description:
> > Update FragmentProcessor TextureSampler to hold an GrSurfaceProxyView.
> > 
> > In future CLs I will update the Ops that create the TextureSamplers to pass
> > the GrSurfaceProxyView in.
> > 
> > Bug: skia:9556
> > Change-Id: I550dab64974d32e4c3047188063efa2d0832328e
> > Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259164
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> > Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> 
> TBR=egdaniel@google.com,michaelludwig@google.com
> 
> Change-Id: Ic804a52c5c6d16a13a9cc2d85bb959f305134177
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: skia:9556
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259433
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

TBR=egdaniel@google.com,robertphillips@google.com,michaelludwig@google.com

Change-Id: If2af5b5b323858e59c0c8db3b75477d74d78abfd
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:9556
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/259434
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/sksl/SkSLCPPCodeGenerator.cpp b/src/sksl/SkSLCPPCodeGenerator.cpp
index f77af09..6de36bf 100644
--- a/src/sksl/SkSLCPPCodeGenerator.cpp
+++ b/src/sksl/SkSLCPPCodeGenerator.cpp
@@ -1018,10 +1018,10 @@
                     String nameString(decl.fVar->fName);
                     const char* name = nameString.c_str();
                     if (decl.fVar->fType.kind() == Type::kSampler_Kind) {
-                        this->writef("        GrSurfaceProxy& %sProxy = "
-                                     "*_outer.textureSampler(%d).proxy();\n",
+                        this->writef("        const GrSurfaceProxyView& %sView = "
+                                     "_outer.textureSampler(%d).view();\n",
                                      name, samplerIndex);
-                        this->writef("        GrTexture& %s = *%sProxy.peekTexture();\n",
+                        this->writef("        GrTexture& %s = *%sView.proxy()->peekTexture();\n",
                                      name, name);
                         this->writef("        (void) %s;\n", name);
                         ++samplerIndex;