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Js2at is a project that allows web pages and ChromeVox to exchange messages that
conform to a set of approved schemas, and can allow page behavior to be
customized.

Note: js2at is currently built as an extension. If it is ever built into the
browser the connection mechanism may change, and this line may no longer be
necessary.

The following code connects to js2at:
chrome.runtime.onConnectExternal.addListener((port) => {
  if (port.name === 'js2at->cvox') { /* Do something */ }
});
js2atPort.onMessage.addEventLister(receiveMessageCallback);
js2atPort.postMessage(messageToSend);

Bug: None
Change-Id: I5d662c641d6534d6c02bb2777ae13c0a3a725dfa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610477Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659246}