Add proprietary_codecs.gn #16716

Job	Run time
chromium_linux-x64 / initialize	1m 20s
chromium_linux-x64 / initialize	1m 20s
linux / initialize	1m 17s
linux / initialize	1m 17s
linux / docker-build-image	3m 50s
linux / docker-build-image	3m 50s
chromium_linux-x64 / docker-build-image	3m 48s
chromium_linux-x64 / docker-build-image	3m 48s
linux / x64_devel	33m 26s
linux / x64_devel	33m 26s
linux / x64_debug	34m 30s
linux / x64_debug	34m 30s
linux / x64_qa	33m 46s
linux / x64_qa	33m 46s
linux / x64_gold	41m 33s
linux / x64_gold	41m 33s
chromium_linux-x64 / x64_devel	24m 26s
chromium_linux-x64 / x64_devel	24m 26s
chromium_linux-x64 / x64_debug	6m 0s
chromium_linux-x64 / x64_debug	24m 34s
chromium_linux-x64 / x64_qa	26m 28s
chromium_linux-x64 / x64_qa	26m 28s
chromium_linux-x64 / x64_gold	29m 5s
chromium_linux-x64 / x64_gold	29m 5s
	8h 17m 32s

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