Marking three GMs ignore-failure

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

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 18231 matching lines @@
           "bitmap-64bitMD5", 
           11558777522282590832
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "shadertext2_msaa16.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          1729916360334344548
+          3280492970607995656
         ]
       ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "shadertext2_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           5441129619971163954
         ]
       ], 
       "reviewed-by-human": true
@@ skipping 3293 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11835374726311942978
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }