This is the test to see the availability of user media in chrome.

webkitGUMTest

// The format for getting user media stream in chrome.
// navigator.webkitGetUserMedia(constraints, successCallback, errorCallback);

navigator.webkitGetUserMedia(
  {
    video:true
  },
  function(stream) {
    console.log('Got a video stream');
  }, 
  function(error) {
    console.log('navigator.webkitGetUserMedia error');
  });