Add path renderer selection spew

Change-Id: If39963605dfa24cc14548e2abdd965ad55a1a561
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/284736
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrRenderTargetContext.cpp b/src/gpu/GrRenderTargetContext.cpp
index bb4c6ca..f3f6d23 100644
--- a/src/gpu/GrRenderTargetContext.cpp
+++ b/src/gpu/GrRenderTargetContext.cpp
@@ -2437,6 +2437,9 @@
             pr = this->drawingManager()->getPathRenderer(canDrawArgs, true, kType);
         } else {
             pr = this->drawingManager()->getSoftwarePathRenderer();
+#if GR_PATH_RENDERER_SPEW
+            SkDebugf("falling back to: %s\n", pr->name());
+#endif
         }
     }