Fixes modifier handling for repeat keys.

ui/keyboard/resources/elements/kb-shift-key.html

 <!--
   -- 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.
   -->
 
 <polymer-element name="kb-shift-key"
     attributes="lowerCaseKeysetId upperCaseKeysetId"
     class="shift dark" char="Shift" on-pointerout="out" extends="kb-key">
   <script>
@@ skipping 126 matching lines @@
               return;
             } else {
               state = KEY_STATES.LOCKED;
               detail.toKeyset = this.upperCaseKeysetId;
               detail.nextKeyset = undefined;
             }
             this.fire('key-longpress', detail);
           }, null, LONGPRESS_DELAY_MSEC);
         },
 
+        // @return Whether the shift modifier is currently active.
+        isActive: function() {
+          return state != KEY_STATES.UNLOCKED;
+        },
+
         /**
          * Callback function for when a double click is triggered.
          */
         onDoubleClick: function() {
           state = KEY_STATES.LOCKED;
         },
 
         /**
          * Notifies shift key that a non-control key was pressed down.
          * A control key is defined as one of shift, control or alt.
          */
         onNonControlKeyDown: function() {
-           switch (state) {
-             case (KEY_STATES.TAPPED):
-               state = KEY_STATES.UNLOCKED;
-               break;
-             case (KEY_STATES.PRESSED):
-               state = KEY_STATES.CHORDING;
-               // Disable longpress timer.
-               clearTimeout(shiftLongPressTimer);
-               break;
-             default:
-               break;
-           }
-         },
+          switch (state) {
+            case (KEY_STATES.PRESSED):
+              state = KEY_STATES.CHORDING;
+              // Disable longpress timer.
+              clearTimeout(shiftLongPressTimer);
+              break;
+            default:
+              break;
+          }
+        },
+
+        /**
+         * Notifies key that a non-control keyed was typed.
+         * A control key is defined as one of shift, control or alt.
+         */
+        onNonControlKeyTyped: function() {
+          if (state == KEY_STATES.TAPPED)
+            state = KEY_STATES.UNLOCKED;
+        },
 
         /**
          * Callback function for when a space is pressed after punctuation.
          * @return {Object} The keyset transitions the keyboard should make.
          */
         onSpaceAfterPunctuation: function() {
            var detail = {};
            detail.toKeyset = this.upperCaseKeysetId;
            detail.nextKeyset = this.lowerCaseKeysetId;
            state = KEY_STATES.TAPPED;
@@ skipping 52 matching lines @@
             case KEY_STATES.UNLOCKED:
               return this.lowerCaseKeysetId;
             default:
               return this.upperCaseKeysetId;
           }
         },
       });
     })();
   </script>
 </polymer-element>