Move all browser/platform detecting in utils/Browser.js

src/utils/Browser.js

@@ -9,9 +9,18 @@
  * @module xterm/utils/Browser
  */
 
+import { contains } from './Generic.js';
 
 let userAgent = navigator.userAgent;
 let platform = navigator.platform;
 
 export let isFirefox = !!~userAgent.indexOf('Firefox');
 export let isMSIE = !!~userAgent.indexOf('MSIE');
+
+// Find the users platform. We use this to interpret the meta key
+// and ISO third level shifts.
+// http://stackoverflow.com/q/19877924/577598
+export let isMac = contains(platform, ['Macintosh', 'MacIntel', 'MacPPC', 'Mac68K']);
+export let isIpad = platform === 'iPad';
+export let isIphone = platform === 'iPhone';
+export let isMSWindows = contains(platform, ['Windows', 'Win16', 'Win32', 'WinCE']);