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 141 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 17 matching lines @@
   # epoger will re-enable by 10 April 2014
   'conditions': [
     [ 'skia_os == "android"', {
       'sources!': [
         '../gm/imagefilterscropexpand.cpp',
       ],
     }],
     # base class for GMs
   ],
 }