Add filemorf pdf experimental workload #885

Job	Run time
Test Build	31s
Test Browser on macOS (safari, default)	1m 39s
Test Shell (v8, disabled)	1m 21s
Test Shell (spidermonkey, default)	4m 42s
Test Shell (jsc, default)	2m 48s
Test Shell (jsc, main)	49s
Test Browser on macOS (safari, disabled)	1m 13s
Test Browser on Linux (firefox, main)	1m 2s
Test Browser on Linux (chrome, disabled)	54s
Test Shell (spidermonkey, main)	47s
Test Browser on macOS (safari, main)	56s
Test Browser on Linux (chrome, main)	34s
Test Browser on Linux (firefox, default)	1m 37s
Test Browser on Linux (firefox, disabled)	1m 24s
Test Shell (v8, default)	2m 28s
Test Shell (v8, main)	40s
Test Shell (spidermonkey, disabled)	1m 46s
Test Browser on Linux (chrome, default)	1m 9s
Test Shell (jsc, disabled)	1m 34s
	27m 54s

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