Moving 4 SkImageFilter derived classes from blink to skia

gyp/gmslides.gypi

 # include this gypi to include all the golden master slides.
 {
   'sources': [
     '../gm/aaclip.cpp',
     '../gm/aarectmodes.cpp',
     '../gm/alphagradients.cpp',
     '../gm/arcofzorro.cpp',
     '../gm/arithmode.cpp',
     '../gm/beziereffects.cpp',
     '../gm/bicubicfilter.cpp',
@@ skipping 68 matching lines @@
     '../gm/internal_links.cpp',
     '../gm/lcdtext.cpp',
     '../gm/linepaths.cpp',
     '../gm/matrixconvolution.cpp',
     '../gm/megalooper.cpp',
     '../gm/mixedxfermodes.cpp',
     '../gm/modecolorfilters.cpp',
     '../gm/morphology.cpp',
     '../gm/nested.cpp',
     '../gm/ninepatchstretch.cpp',
+    '../gm/offsetimagefilter.cpp',
     '../gm/optimizations.cpp',
     '../gm/ovals.cpp',
     '../gm/patheffects.cpp',
     '../gm/pathfill.cpp',
     '../gm/pathinterior.cpp',
     '../gm/pathopsinverse.cpp',
     '../gm/pathopsskpclip.cpp',
     '../gm/pathreverse.cpp',
     '../gm/perlinnoise.cpp',
     '../gm/points.cpp',
@@ skipping 19 matching lines @@
     '../gm/strokefill.cpp',
     '../gm/strokerect.cpp',
     '../gm/strokerects.cpp',
     '../gm/strokes.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',
     '../gm/twopointradial.cpp',
     '../gm/typeface.cpp',
     '../gm/verttext.cpp',
     '../gm/verttext2.cpp',
     '../gm/verylargebitmap.cpp',
     '../gm/xfermodeimagefilter.cpp',
     '../gm/xfermodes.cpp',
     '../gm/xfermodes2.cpp',
     '../gm/xfermodes3.cpp',
   ],
 }
 
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