title: Does chrome have public APIs for appcache, formData etc to be used in extensions
body: <p>Chrome has 
  <code>browsingData</code> permission has the api to remove <code>appcache, cache, formData, indexedDB, passwords, pluginData, serverBoundCertificates, service workers, webSQL,</code></p>
  
  <p>However, I wonder, if there are public API's to query the data stored or check the amount of data present in various kinds of storages provided above.</p>