gm to test hairlines which fill RenderTarget

gyp/gmslides.gypi

 # include this gypi to include all the golden master slides.
 {
   'include_dirs': [
     '../gm',
     # include dirs needed by particular GMs
     '../src/utils/debugger',
     '../src/images',
     '../src/lazy',
   ],
   'conditions': [
@@ skipping 160 matching lines @@
         '../gm/selftest.cpp',
         '../gm/shadertext.cpp',
         '../gm/shadertext2.cpp',
         '../gm/shadertext3.cpp',
         '../gm/shadows.cpp',
         '../gm/shallowgradient.cpp',
         '../gm/simpleaaclip.cpp',
         '../gm/skbug1719.cpp',
         '../gm/smallarc.cpp',
         '../gm/smallimage.cpp',
-        '../gm/stringart.cpp',
         '../gm/spritebitmap.cpp',
         '../gm/srcmode.cpp',
+        '../gm/stlouisarch.cpp',
+        '../gm/stringart.cpp',
         '../gm/strokefill.cpp',
         '../gm/strokerect.cpp',
         '../gm/strokerects.cpp',
         '../gm/strokes.cpp',
         '../gm/stroketext.cpp',
         '../gm/surface.cpp',
         '../gm/tablecolorfilter.cpp',
         '../gm/texteffects.cpp',
         '../gm/testimagefilters.cpp',
         '../gm/texdata.cpp',
@@ skipping 57 matching lines @@
         '../gm/shadertext2.cpp',
         '../gm/shadertext3.cpp',
 
         # TODO(reed): Allocates more memory than Android devices are capable of
         # fulfilling. See http://skbug.com/1978
         '../gm/verylargebitmap.cpp',
       ],
     }],
   ],
 }