Update some flaky GMs to see if they stick.

expectations/gm/Test-Win8-ShuttleA-HD7770-x86_64-Debug/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 4987 matching lines @@
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }, 
     "dftext_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          3168997034693954414
+          15579862310139097370
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "discard_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11635187478196931850
         ]
@@ skipping 5457 matching lines @@
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }, 
     "pathfill_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          8352678307805267373
+          567436552722100323
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "pathfill_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           1313008434183403262
         ]
@@ skipping 528 matching lines @@
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }, 
     "polygons_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          15641546627497285513
+          698120024072762764
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "polygons_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11545521910555847306
         ]
@@ skipping 3058 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           18282805787534784798
         ]
       ], 
       "reviewed-by-human": true
     }
   }
 }