Convert Event#keyIdentifier (deprecated) to Event#key

ui/webui/resources/js/util.js

Index: ui/webui/resources/js/util.js
diff --git a/ui/webui/resources/js/util.js b/ui/webui/resources/js/util.js
index 048a674ed1980061b6cb9802866a25fefdd75a55..b3fb8d485279e2eee2571d30877bea460ea32abd 100644
--- a/ui/webui/resources/js/util.js
+++ b/ui/webui/resources/js/util.js
@@ -372,3 +372,69 @@ function elide(original, maxLength) {
 function quoteString(str) {
   return str.replace(/([\\\.\+\*\?\[\^\]\$\(\)\{\}\=\!\<\>\|\:])/g, '\\$1');
 }
+
+<if expr="is_ios">
+// Polyfill 'key' in KeyboardEvent for iOS.
+// This function is not intended to be complete but should
+// be sufficient enough to have iOS work correctly while
+// it does not support key yet.
+if (!('key' in KeyboardEvent.prototype)) {
+  Object.defineProperty(KeyboardEvent.prototype, 'key', {
+    get: function () {
+      // 0-9
+      if (this.keyCode >= 0x30 && this.keyCode <= 0x39)
+        return String.fromCharCode(this.keyCode);
+
+      // A-Z
+      if (this.keyCode >= 0x41 && this.keyCode <= 0x5a) {
+        var result = String.fromCharCode(this.keyCode).toLowerCase();
+        if (this.shiftKey)
+          result = result.toUpperCase();
+        return result;
+      }
+
+      // Special characters
+      switch(this.keyCode) {
+        case 0x08: return 'Backspace';
+        case 0x09: return 'Tab';
+        case 0x0d: return 'Enter';
+        case 0x10: return 'Shift';
+        case 0x11: return 'Control';
+        case 0x12: return 'Alt';
+        case 0x1b: return 'Escape';
+        case 0x20: return ' ';
+        case 0x21: return 'PageUp';
+        case 0x22: return 'PageDown';
+        case 0x23: return 'End';
+        case 0x24: return 'Home';
+        case 0x25: return 'ArrowLeft';
+        case 0x26: return 'ArrowUp';
+        case 0x27: return 'ArrowRight';
+        case 0x28: return 'ArrowDown';
+        case 0x2d: return 'Insert';
+        case 0x2e: return 'Delete';
+        case 0x5b: return 'Meta';
+        case 0x70: return 'F1';
+        case 0x71: return 'F2';
+        case 0x72: return 'F3';
+        case 0x73: return 'F4';
+        case 0x74: return 'F5';
+        case 0x75: return 'F6';
+        case 0x76: return 'F7';
+        case 0x77: return 'F8';
+        case 0x78: return 'F9';
+        case 0x79: return 'F10';
+        case 0x7a: return 'F11';
+        case 0x7b: return 'F12';
+        case 0xbb: return '=';
+        case 0xbd: return '-';
+        case 0xdb: return '[';
+        case 0xdd: return ']';
+      }
+      return 'Unidentified';
+    }
+  });
+} else {
+  window.console.log("KeyboardEvent.Key polyfill not required");
+}
+</if>  /* is_ios */