Add GM mixed_xfermodes. This is a work in progress and will be used to test fixes for GPU Xfermodes…

gyp/gmslides.gypi

 # include this gypi to include all the golden master slides.
 {
   'sources': [
     '../gm/aaclip.cpp',
     '../gm/aarectmodes.cpp',
     '../gm/arithmode.cpp',
     '../gm/bicubicfilter.cpp',
     '../gm/bigmatrix.cpp',
     '../gm/bitmapcopy.cpp',
     '../gm/bitmapmatrix.cpp',
@@ skipping 37 matching lines @@
     '../gm/imageblur.cpp',
     '../gm/imagemagnifier.cpp',
     '../gm/lighting.cpp',
     '../gm/image.cpp',
     '../gm/imagefiltersbase.cpp',
     '../gm/imagefiltersgraph.cpp',
     '../gm/internal_links.cpp',
     '../gm/lcdtext.cpp',
     '../gm/linepaths.cpp',
     '../gm/matrixconvolution.cpp',
+    '../gm/mixedxfermodes.cpp',
     '../gm/modecolorfilters.cpp',
     '../gm/morphology.cpp',
     '../gm/ninepatchstretch.cpp',
     '../gm/nocolorbleed.cpp',
     '../gm/patheffects.cpp',
     '../gm/pathfill.cpp',
     '../gm/pathinterior.cpp',
     '../gm/pathreverse.cpp',
     '../gm/points.cpp',
     '../gm/poly2poly.cpp',
@@ skipping 29 matching lines @@
     '../gm/verylargebitmap.cpp',
     '../gm/xfermodes.cpp',
   ],
 }
 
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