add gm: colorwheel

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 31 matching lines @@
         '../gm/circles.cpp',
         '../gm/circularclips.cpp',
         '../gm/clip_strokerect.cpp',
         '../gm/clippedbitmapshaders.cpp',
         '../gm/colorcube.cpp',
         '../gm/coloremoji.cpp',
         '../gm/colorfilterimagefilter.cpp',
         '../gm/colorfilters.cpp',
         '../gm/colormatrix.cpp',
         '../gm/colortype.cpp',
+        '../gm/colorwheel.cpp',
         '../gm/complexclip.cpp',
         '../gm/complexclip2.cpp',
         '../gm/composeshader.cpp',
         #'../gm/conicpaths.cpp',
         '../gm/convexpaths.cpp',
         '../gm/convexpolyclip.cpp',
         '../gm/convexpolyeffect.cpp',
         '../gm/copyTo4444.cpp',
         '../gm/cubicpaths.cpp',
         '../gm/cmykjpeg.cpp',
@@ skipping 172 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',
       ],
     }],
   ],
 }