Add H.265 support

[pecord]

I know the android version supports H.265 and its great, wish I could do the same on PC. I saw there is a way to compile Chromium with H.265 support, curious if it would be possible to implement that.

chromium - win64 w/ h.265
https://github.com/henrypp/chromium/releases

[cgutman]

Unfortunately there's no PP_VideoProfile define to specify H.265 video.

https://developer.chrome.com/native-client/pepper_dev/c/group___enums.html#ga4d50d27186f68b2de578e82162206fea

[stale]

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