Add GM that tests GrTextureDomain and fix bug where kDecal_Mode gets incorrectly ignored.

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 140 matching lines @@
     '../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/texturedomaineffect.cpp',
     '../gm/thinrects.cpp',
     '../gm/thinstrokedrects.cpp',
     '../gm/tileimagefilter.cpp',
     '../gm/tilemodes.cpp',
     '../gm/tilemodes_scaled.cpp',
     '../gm/tinybitmap.cpp',
     '../gm/twopointradial.cpp',
     '../gm/typeface.cpp',
     '../gm/vertices.cpp',
     '../gm/verttext.cpp',
@@ skipping 46 matching lines @@
         # fulfilling. See http://skbug.com/1978
         '../gm/verylargebitmap.cpp',
       ],
 
       'sources': [
         '../gm/androidfallback.cpp',
       ],
     }],
   ],
 }