Add maximum screen size into constraint for webkitGetuserMedia()

chrome/common/extensions/docs/examples/api/desktopCapture/app.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.
 
 function gotStream(stream) {
   console.log("Received local stream");
   var video = document.querySelector("video");
   video.src = URL.createObjectURL(stream);
   localstream = stream;
   stream.onended = function() { console.log("Ended"); };
 }
 
 function getUserMediaError() {
   console.log("getUserMedia() failed.");
 }
 
 function onAccessApproved(id) {
   if (!id) {
     console.log("Access rejected.");
     return;
   }
+
   navigator.webkitGetUserMedia({
-      audio:false,
-      video: { mandatory: { chromeMediaSource: "desktop",
-                            chromeMediaSourceId: id } }
+    audio:false,
+    video: {
+      mandatory: {
+        chromeMediaSource: "desktop",
+        chromeMediaSourceId: id,
+        maxWidth:screen.width,
+        maxHeight:screen.height} }
   }, gotStream, getUserMediaError);
 }
 
 var pending_request_id = null;
 
 document.querySelector('#start').addEventListener('click', function(e) {
   pending_request_id = chrome.desktopCapture.chooseDesktopMedia(
       ["screen", "window"], onAccessApproved);
 });
 
 document.querySelector('#cancel').addEventListener('click', function(e) {
   if (pending_request_id != null) {
     chrome.desktopCapture.cancelChooseDesktopMedia(pending_request_id);
   }
 });
 
 document.querySelector('#startFromBackgroundPage')
     .addEventListener('click', function(e) {
       chrome.runtime.sendMessage(
           {}, function(response) { console.log(response.farewell); });
     });