Skip startup animations with startDelay #857

Job	Run time
Test Browser on macOS (safari, default)	2m 46s
Test Browser on macOS (safari, main)	56s
Test Build	31s
Test Browser on Linux (firefox, disabled)	1m 18s
Test Browser on Linux (chrome, default)	1m 13s
Test Browser on Linux (firefox, default)	1m 36s
Test Shell (spidermonkey, default)	4m 56s
Test Browser on Linux (chrome, main)	48s
Test Shell (jsc, main)	55s
Test Shell (v8, default)	2m 40s
Test Shell (jsc, default)	3m 32s
Test Shell (spidermonkey, disabled)	2m 6s
Test Browser on Linux (chrome, disabled)	1m 1s
Test Browser on Linux (firefox, main)	1m 9s
Test Shell (spidermonkey, main)	47s
Test Shell (jsc, disabled)	1m 47s
Test Shell (v8, main)	38s
Test Shell (v8, disabled)	1m 26s
Test Browser on macOS (safari, disabled)	2m 44s
	32m 49s

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