adding some flaky gms to ignore

expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 14999 matching lines @@
       ], 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_invpathclip_tiled_msaa16.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           9769883945866659220
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "multipicturedraw_invpathclip_tiled_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           3864820619026767690
         ]
       ], 
       "reviewed-by-human": true
@@ skipping 6744 matching lines @@
     "yuv_to_rgb_effect_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11835374726311942978
         ]
       ], 
       "reviewed-by-human": true
     }
   }
-}
+}