Enable virtual contexts for all ARM T-6xx models instead of just T-604

BUG=294779,282479

Review URL: https://chromiumcodereview.appspot.com/24051003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224977 0039d316-1c4b-4281-b951-d872f2087c98
[rAc] Use int64 for result of base::TimeTicks::ToSeconds()

Using int instead of int64 causes incorrect behavior (due to truncation) on
systems with very high uptimes.  (Curse you, implicit casts!)

BUG=none
TEST=none
TBR=estade@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24363007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@224978 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 224978