Add /resources/shape.gif

Trying to add this first before https://codereview.chromium.org/186783003/

NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=168517

Review URL: https://codereview.chromium.org/187673007

git-svn-id: svn://svn.chromium.org/blink/trunk@168524 bbb929c8-8fbe-4397-9dbb-9b2b20218538