ccpr: Add an MSAA atlas mode

Adds the option to use a multisampled (or mixed sampled) atlas, and
uses the sample mask and stencil buffer instead of coverage counts.

Bug: skia:
Change-Id: I9fb76d17895ae25208124f6c27e37977ac31b5eb
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227428
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 55de6f8..fe116a9 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -268,7 +268,7 @@
     gPathRendererNames[GpuPathRenderers::kAll] = "All Path Renderers";
     gPathRendererNames[GpuPathRenderers::kStencilAndCover] = "NV_path_rendering";
     gPathRendererNames[GpuPathRenderers::kSmall] = "Small paths (cached sdf or alpha masks)";
-    gPathRendererNames[GpuPathRenderers::kCoverageCounting] = "Coverage counting";
+    gPathRendererNames[GpuPathRenderers::kCoverageCounting] = "CCPR";
     gPathRendererNames[GpuPathRenderers::kTessellating] = "Tessellating";
     gPathRendererNames[GpuPathRenderers::kNone] = "Software masks";