Non-rect polygons are not covered in GM cases, such as triangle, trapezoid, diamond, polygons with lots of edges, concave polygons, etc, especially for stroke-style and stroke-and-fill style painters. So add a GM case to avoid potential rendering errors.

R=bsalomon@google.com, robertphillips@google.com

Author: yunchao.he@intel.com

Review URL: https://codereview.chromium.org/80483002

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@12413 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gmslides.gypi b/gmslides.gypi
index ba7c1ca..c8a82c2 100644
--- a/gmslides.gypi
+++ b/gmslides.gypi
@@ -105,6 +105,7 @@
     '../gm/perlinnoise.cpp',
     '../gm/points.cpp',
     '../gm/poly2poly.cpp',
+    '../gm/polygons.cpp',
     '../gm/quadpaths.cpp',
     '../gm/rects.cpp',
     '../gm/rrect.cpp',