|kDisableAcceleratedVideoDecode| [1] seems to also alter the
"decode" behaviour, but in its use, it affects both decode
_and_ encode [2].

Consider renaming the flag (and message in about::flags etc)
or changing its influence(s).


[1] https://code.google.com/p/chromium/codesearch#chromium/src/content/public/common/content_switches.cc&l=99&ct=xref_jump_to_def&cl=GROK&gsn=kDisableAcceleratedVideoDecode
[2] https://code.google.com/p/chromium/codesearch#chromium/src/content/renderer/render_thread_impl.cc&rcl=1464794495&l=1427