GitLab

SIMD requires aligned loads or it'll crash.

BUG=357840
TEST=new unittest. played video back in crashes.
R=rileya@chromium.org, scherkus@chromium.org
TBR=scherkus

Review URL: https://codereview.chromium.org/217923002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260336 0039d316-1c4b-4281-b951-d872f2087c98