Add resource loading bar (#246) #784

Job	Run time
Test Browser on macOS (safari, default)	1m 56s
Test Browser on macOS (safari, main)	1m 13s
Test Browser on macOS (safari, disabled)	2m 22s
Test Build	27s
Test Browser on Linux (chrome, main)	50s
Test Shell (spidermonkey, main)	50s
Test Browser on Linux (firefox, main)	53s
Test Shell (spidermonkey, disabled)	1m 55s
Test Browser on Linux (chrome, disabled)	1m 9s
Test Browser on Linux (firefox, disabled)	1m 19s
Test Browser on Linux (firefox, default)	1m 35s
Test Browser on Linux (chrome, default)	1m 12s
Test Shell (spidermonkey, default)	5m 15s
Test Shell (v8, disabled)	1m 38s
Test Shell (jsc, disabled)	1m 46s
Test Shell (jsc, main)	50s
Test Shell (v8, main)	42s
Test Shell (jsc, default)	3m 8s
Test Shell (v8, default)	2m 38s
	31m 38s

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