add gm to show bug in stroked-text in drawPosText

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',
   ],
   'sources': [
@@ skipping 135 matching lines @@
     '../gm/shallowgradient.cpp',
     '../gm/simpleaaclip.cpp',
     '../gm/skbug1719.cpp',
     '../gm/stringart.cpp',
     '../gm/spritebitmap.cpp',
     '../gm/srcmode.cpp',
     '../gm/strokefill.cpp',
     '../gm/strokerect.cpp',
     '../gm/strokerects.cpp',
     '../gm/strokes.cpp',
+    '../gm/stroketext.cpp',
     '../gm/tablecolorfilter.cpp',
     '../gm/texteffects.cpp',
     '../gm/testimagefilters.cpp',
     '../gm/texdata.cpp',
     '../gm/thinrects.cpp',
     '../gm/thinstrokedrects.cpp',
     '../gm/tileimagefilter.cpp',
     '../gm/tilemodes.cpp',
     '../gm/tilemodes_scaled.cpp',
     '../gm/tinybitmap.cpp',
@@ skipping 11 matching lines @@
     # Files needed by particular GMs
     '../src/utils/debugger/SkDrawCommand.h',
     '../src/utils/debugger/SkDrawCommand.cpp',
     '../src/utils/debugger/SkDebugCanvas.h',
     '../src/utils/debugger/SkDebugCanvas.cpp',
     '../src/utils/debugger/SkObjectParser.h',
     '../src/utils/debugger/SkObjectParser.cpp',
 
   ],
 }