title: Property 'webkitTemporaryStorage' does not exist on type 'Navigator'
body: <p>I am using below code to check size of <strong>indexeddb</strong></p>
  
  <pre><code>navigator.webkitTemporaryStorage.queryUsageAndQuota ( 
  function(usedBytes, grantedBytes) {  
      console.log('we are using ', usedBytes, ' of ', grantedBytes, 'bytes');
  }, 
  function(e) { console.log('Error', e);  }
  );
  </code></pre>
  
  <p>But got error like Property <code>webkitTemporaryStorage</code> does not exist on type <code>Navigator</code>.</p>
  
  <p>I am new to angular. can anyone pls help me solve this.</p>
  
  <p>Thanks</p>