Some information about WebM/VP8 hardware support: http://en.wikipedia.org/wiki/WebM#Hardware

Notably, "Nvidia is supporting VP8 and provides both hardware decoding and encoding in the Tegra 4 chipset."

Most of the newer Arm chips have hardware WebM support. http://wiki.webmproject.org/hardware/arm-socs .

Most of the main chip makers seem to have agreed to support it [1], but it's taking too much time to bring it to their chips. For example in 2014 I'm not going to care about wide VP8 support anymore. In 2014 I want to already see wide support for VP9, since VP9 is the next-gen codec.

[1] http://en.wikipedia.org/wiki/WebM#Hardware