Adds client side arrays
The code is conditional. I guess my gaming side
spidey senses can't stand the overhead but
I could be convinced to make it non-conditional.
TEST=various unit tests
BUG=none
Review URL: http://codereview.chromium.org/1629004
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@44334 0039d316-1c4b-4281-b951-d872f2087c98