Ignore failures for n7 and n10 dftext GM.

expectations/gm/Test-Android-Nexus7-Tegra3-Arm7-Release/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 3581 matching lines @@
           8850017817310905002
         ]
       ], 
       "ignore-failure": false, 
       "reviewed-by-human": true
     }, 
     "dftext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          9827605298867646184
+          578599045075634191
         ]
       ], 
+      "bugs": [
+        3188
+      ], 
+      "ignore-failure": true, 
       "reviewed-by-human": true
     }, 
     "discard_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11635187478196931850
         ]
       ], 
       "reviewed-by-human": true
@@ skipping 6746 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           16415218204576550093
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }