Reland: Add resource loading bar #812

Job	Run time
Test Browser on macOS (safari, disabled)	1m 53s
Test Browser on macOS (safari, main)	1m 2s
Test Browser on Linux (firefox, disabled)	1m 20s
Test Browser on Linux (firefox, default)	1m 33s
Test Build	1m 1s
Test Browser on macOS (safari, default)	1m 35s
Test Browser on Linux (firefox, main)	55s
Test Browser on Linux (chrome, default)	1m 10s
Test Shell (jsc, default)	1m 43s
Test Shell (spidermonkey, main)	47s
Test Browser on Linux (chrome, disabled)	1m 2s
Test Shell (spidermonkey, default)	5m 2s
Test Browser on Linux (chrome, main)	26s
Test Shell (jsc, main)	45s
Test Shell (v8, default)	2m 40s
Test Shell (jsc, disabled)	1m 43s
Test Shell (spidermonkey, disabled)	1m 50s
Test Shell (v8, main)	38s
Test Shell (v8, disabled)	1m 32s
Test Shell (jsc, disabled)	1m 43s
Test Browser on macOS (safari, default)	1m 35s
Test Browser on Linux (chrome, default)	1m 10s
Test Browser on Linux (chrome, disabled)	1m 2s
Test Shell (spidermonkey, disabled)	1m 50s
Test Build	1m 1s
Test Shell (jsc, default)	3m 9s
Test Shell (v8, disabled)	1m 32s
Test Browser on Linux (chrome, main)	26s
Test Browser on macOS (safari, main)	1m 2s
Test Shell (v8, default)	2m 40s
Test Browser on Linux (firefox, default)	1m 33s
Test Shell (spidermonkey, main)	47s
Test Shell (v8, main)	38s
Test Browser on Linux (firefox, disabled)	1m 20s
Test Browser on Linux (firefox, main)	55s
Test Shell (jsc, main)	45s
Test Shell (spidermonkey, default)	5m 2s
Test Browser on macOS (safari, disabled)	1m 53s
	58m 40s

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