Call makeContextCurrent in places that are missing it.

      This is NDuca's patch but security wants it NOW for M11 update.
The original patch is here
http://codereview.chromium.org/7050024

BUG=82873
TEST=ran a long time in debugger with case that crashed before this patch
TBR=nduca@chromium.org

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@86019 0039d316-1c4b-4281-b951-d872f2087c98