Add a simple tool for isolating a path from an SKP

BUG=skia:

Change-Id: I5ca9bbd43919e3f65ea940847c68f85cc78dfeda
Reviewed-on: https://skia-review.googlesource.com/10130
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Jim Van Verth <jvanverth@google.com>
diff --git a/gn/samples.gni b/gn/samples.gni
index 7f8f3b9..13a762c 100644
--- a/gn/samples.gni
+++ b/gn/samples.gni
@@ -70,6 +70,7 @@
   "$_samplecode/SamplePathText.cpp",
   "$_samplecode/SamplePathClip.cpp",
   "$_samplecode/SamplePathEffects.cpp",
+  "$_samplecode/SamplePathFinder.cpp",
   "$_samplecode/SamplePathFuzz.cpp",
   "$_samplecode/SamplePathOverstroke.cpp",
   "$_samplecode/SamplePdfFileViewer.cpp",