The official blog they say the release of the stable version of Chrome 21 browser. The new browser web applications can access the microphone and webcam user. Plug-ins like Flash or Silverlight is required. The application has access to the devices after the consent is given by the user. In Chrome 21 adds support for high resolution screens.
This will ensure a comfortable fit with a browser to owners of new "MacBook" with displays Retina. Previously, support resolution of 2880 by 1800 pixels provided only its own browser Apple - Safari.