Rebaseline dashing3 GMs for r12357

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Release-DirectWrite/expected-results.json

 {
   "actual-results": {
     "failed": null, 
     "failure-ignored": null, 
     "no-comparison": null, 
     "succeeded": null
   }, 
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
@@ skipping 4165 matching lines @@
           "bitmap-64bitMD5", 
           5129847220107176754
         ]
       ], 
       "ignore-failure": false
     }, 
     "dashing3_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          15857302678163965353
+          1968311162567272920
         ]
       ], 
       "ignore-failure": false
     }, 
     "dashing3_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           10475351773979495594
         ]
@@ skipping 7241 matching lines @@
           15521667491547564445
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }