rebaseline srcmode for gpus -- now pass samplecount

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

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 13612 matching lines @@
           "bitmap-64bitMD5", 
           14019814087375927425
         ]
       ], 
       "bugs": [
         1935
       ], 
       "reviewed-by-human": false
     }
   }
-}
+}