Ignore GM dashing_gpu on Debug ANGLE

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Debug-ANGLE/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 5643 matching lines @@
       "ignore-failure": false
     }, 
     "dashing_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           9619819203956748282
         ]
       ], 
       "bugs": [
-        1578
+        1844
       ], 
-      "reviewed-by-human": false
+      "ignore-failure": true, 
+      "reviewed-by-human": true
     }, 
     "dashing_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           18292104043667314195
         ]
       ], 
       "bugs": [
         1578
@@ skipping 9524 matching lines @@
           4724434148619046918
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }