title: How to force keyboard shortcut on chrome extension at install
body: <p>I'm trying to implement a chrome extension firing a event with a keyboard shortcut.</p>
  
  <p>The shortcut is declared here : </p>
  
  <pre><code>    "commands":{
      "sample":{
          "suggested_key" : {
              "default":"Ctrl+I",
              "windows":"Ctrl+I"
          },
          "description":"Refresh display",
          "global": true
      }
  }
  </code></pre>
  
  <p>All seems legit, but the problem is that I must set my keyboard shortcut manually in the "Keyboard shortcut" Chrome's menu.</p>
  
  <p>I must force this at extension's installation without setting it manually. This extension will be used my automatsand they can't set this manually.</p>
  
  <p>How can I do that ?</p>