[NaCl SDK] Add life App Engine demo.

I removed the fullscreen stuff because it didn't seem to be working properly -- the canvas was fullscreen, but the simulation only used a small portion in the center.

BUG=none
R=sbc@chromium.org

Review URL: https://codereview.chromium.org/45573003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231138 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231138