Reland "Purge ccpr"

This is a reland of 7bf6bc0d0604165841cc788d1deafd96e096530c

Original change's description:
> Purge ccpr
>
> Now that the clip atlas has been successfully migrated to
> tessellation, we don't need this code anymore!
>
> Change-Id: Ic97f50cff7c4ee59f4476f8410f0b30a32df4e90
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419857
> Reviewed-by: Robert Phillips <robertphillips@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>
> Commit-Queue: Chris Dalton <csmartdalton@google.com>

Change-Id: If0be86902e7cc4755eba91a89be1ec1a6a4b54b2
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/419720
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Chris Dalton <csmartdalton@google.com>
diff --git a/src/gpu/GrTextureProxy.h b/src/gpu/GrTextureProxy.h
index 37ac1b1..f060555 100644
--- a/src/gpu/GrTextureProxy.h
+++ b/src/gpu/GrTextureProxy.h
@@ -128,8 +128,8 @@
     // The basic knowledge version is used for DDL where we know the type of proxy we are going to
     // use, but we don't have access to the GPU yet to instantiate it.
     //
-    // The minimal knowledge version is used for CCPR where we are generating an atlas but we do not
-    // know the final size until flush time.
+    // The minimal knowledge version is used for when we are generating an atlas but we do not know
+    // the final size until we have finished adding to it.
     GrTextureProxy(LazyInstantiateCallback&&,
                    const GrBackendFormat&,
                    SkISize,