More circle rebaselines on gpu

expectations/gm/Test-Mac10.9-MacMini6.2-HD4000-x86_64-Release/expected-results.json

 {
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   "expected-results": {
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       "allowed-digests": [
@@ skipping 11489 matching lines @@
           "bitmap-64bitMD5", 
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         ]
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     "image-surface_gpu.png": {
       "allowed-digests": [
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           "bitmap-64bitMD5", 
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@@ skipping 4947 matching lines @@
       ], 
       "bugs": [
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     }, 
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     "shadows_pdf-mac.png": {
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@@ skipping 2944 matching lines @@
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
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         ]
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       "reviewed-by-human": true
     }
   }
 }