[NaCl SDK] Add voronoi app-engine demo.

* Modified source to allow arbitrary-sized canvas.

BUG=none
R=nfullagar@chromium.org, sbc@chromium.org

Review URL: https://codereview.chromium.org/45193002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231133 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231133
Fix the output of "gn args" for the OS and CPU architecture.

The internal declarations of these weren't getting set correctly. This only affects the output of "gn args".

BUG=
R=thakis@chromium.org

Review URL: https://codereview.chromium.org/40533003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231134 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231134