Enlarge window to hold media select dialog completely

chrome/common/extensions/docs/examples/api/desktopCapture/background.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 chrome.app.runtime.onLaunched.addListener(function() {
   chrome.app.window.create('index.html', {
     bounds: {
       width: 1080,
-      height: 420
+      height: 550
     }
   });
 });
 
 chrome.runtime.onMessage.addListener(function(message, sender, sendResponse) {
   chrome.desktopCapture.chooseDesktopMedia(
       ["screen", "window"],
       function(id) {
         sendResponse({"id": id});
       });
 });