Implement gn.py as discussed in design review #16683

Job	Run time
chromium_android-arm64 / initialize	1m 15s
android-arm / initialize	1m 19s
android-arm64 / initialize	1m 20s
android-x86 / initialize	2m 22s
chromium_android-arm / initialize	1m 23s
chromium_android-x86 / initialize	1m 15s
chromium_android-x86 / docker-build-image	3m 36s
chromium_android-arm64 / docker-build-image	3m 51s
android-arm / docker-build-image	3m 49s
android-arm64 / docker-build-image	3m 37s
chromium_android-arm / docker-build-image	3m 35s
android-x86 / docker-build-image	3m 54s
chromium_android-x86 / x86_devel	31m 58s
chromium_android-x86 / x86_debug	31m 57s
chromium_android-x86 / x86_qa	32m 22s
chromium_android-x86 / x86_gold	32m 45s
android-arm64 / arm64_devel	51m 25s
android-arm64 / arm64_debug	21s
android-arm64 / arm64_qa	52m 3s
android-arm64 / arm64_gold	49m 25s
chromium_android-arm / arm_devel	32m 4s
chromium_android-arm / arm_debug	32m 19s
chromium_android-arm / arm_qa	31m 21s
chromium_android-arm / arm_gold	42m 33s
android-arm / arm_devel	31m 27s
android-arm / arm_debug	21s
android-arm / arm_qa	33m 28s
android-arm / arm_gold	42m 6s
chromium_android-arm64 / arm64_devel	53m 50s
chromium_android-arm64 / arm64_debug	48m 47s
chromium_android-arm64 / arm64_qa	50m 21s
chromium_android-arm64 / arm64_gold	48m 58s
android-x86 / x86_devel	34m 13s
android-x86 / x86_debug	20s
android-x86 / x86_qa	33m 20s
android-x86 / x86_gold	34m 7s
	14h 23m 7s

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