Mark pdf filterbitmap images as failure ignored

expectations/gm/Test-Mac10.8-MacMini4.1-GeForce320M-x86-Debug/expected-results.json

 {
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   "expected-results": {
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@@ skipping 7569 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 13 matching lines @@
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@@ skipping 7470 matching lines @@
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 }