Implement Pepper PPB_VideoDecoder interface.
Adds resource and host, unit test for the resource, and an example plugin.
Implements only the hardware accelerated case. Software fallback will be
in a follow-on CL.
Adds two new PP_Error codes:
PP_ERROR_UNREADABLE_INPUT
PP_ERROR_PLATFORM_FAILED
BUG=281689
R=dmichael@chromium.org, fischman@chromium.org, jar@chromium.org, piman@chromium.org, tsepez@chromium.org
Review URL: https://codereview.chromium.org/
270213004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@273920 0039d316-1c4b-4281-b951-d872f2087c98