First round of matrixconvolution rebaselines.

expectations/gm/Test-Mac10.7-MacMini4.1-GeForce320M-x86_64-Release/expected-results.json

 {
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   "expected-results": {
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@@ skipping 8923 matching lines @@
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@@ skipping 4196 matching lines @@
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         ]
       ], 
       "bugs": [
         1578
       ], 
       "reviewed-by-human": false
     }
   }
 }