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Hardware video decode depends on GLX but we may be using OSMesa. In
this case fallback to non-hardware video decode gracefully instead
of static casting to an incorrect type.

This allows us to remove flags forcing non-OSMesa for some tests,
and they will test hardware decode on the ChromeOS VMs still.

These flags must go in order to support browser tests running
with a compositor instead of using legacy software mode, since
GLX inside the bot Xvfb environment can not run the compositor.
(This is a small piece of enabling us to test real code paths
in browser tests https://codereview.chromium.org/120313002/ .)

R=piman
BUG=270918

Review URL: https://codereview.chromium.org/132503002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244111 0039d316-1c4b-4281-b951-d872f2087c98