rebaseline pictureshader GM on GPU

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 9556 matching lines @@
           "bitmap-64bitMD5", 
           761459974185255971
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "pictureshader_gpu.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
-          1423899516760376304
+          16957814945817139278
         ]
       ], 
       "reviewed-by-human": true
     }, 
     "pictureshader_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           71577620991525908
         ]
@@ skipping 2936 matching lines @@
           14157160633878011690
         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }