Layout test to verify pong message from the server.

Issue crbug.com/443651 says that Chrome crashes on receiving pong
messages with a payload. This does not appear to be true, but there
is not an existing layout test testing this case, so add one.

BUG=443651
TEST=layout tests

Review URL: https://codereview.chromium.org/788923007

git-svn-id: svn://svn.chromium.org/blink/trunk@187905 bbb929c8-8fbe-4397-9dbb-9b2b20218538
3 files changed
tree: f5ebd412f9919ab15a81eb8005a3f08b233b788f
  1. third_party/