Rebaseline 565 precision changes and matrixconvolution.

expectations/gm/Test-Win7-ShuttleA-HD2000-x86-Release/expected-results.json

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       "bugs": [
@@ skipping 8424 matching lines @@
       ], 
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       ], 
       "reviewed-by-human": false
     }, 
     "matrixconvolution_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
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@@ skipping 3990 matching lines @@
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       ], 
       "bugs": [
         2146
       ], 
       "reviewed-by-human": false
     }
   }
 }