rebaseline: perspective gradients in pdf

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 6794 matching lines @@
           "bitmap-64bitMD5", 
           2517704404661456558
         ]
       ], 
       "ignore-failure": false
     }, 
     "gradients_view_perspective_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          9749250844822835346
+          8598787236487297865
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }, 
     "gradtext_565.png": {
       "allowed-digests": [
         [
@@ skipping 4160 matching lines @@
           13996013494185391731
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }