First round of matrixconvolution rebaselines.

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

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       "allowed-digests": [
@@ skipping 10049 matching lines @@
           "bitmap-64bitMD5", 
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     "matrixconvolution_pdf-poppler.png": {
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       "allowed-digests": [
         [
@@ skipping 4718 matching lines @@
           9206571293968307032
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 }