We need to copy these png images first because tryserver does not work
very well with binaries in patches. So in order to run the trybots in
the next CL, we need to copy them first.

BUG=338338
TEST=None
R=avi@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/471343002

Cr-Commit-Position: refs/heads/master@{#289954}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289954 0039d316-1c4b-4281-b951-d872f2087c98