Add layout switcher for virtual keyboard.

ui/keyboard/resources/elements/kb-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-key" extends="kb-key-base"
     attributes="keyCode shiftModifier weight">
   <template>
     <style>
@@ skipping 59 matching lines @@
             break;
           default:
             break;
         }
         return detail;
       }
     });
   </script>
 </polymer-element>
 
-<!--
-  -- TODO(kevers): Rip this out if and when we are done implementing the proper
-  -- layout switcher.
-  -->
-<polymer-element name="kb-layout-selector" class="layout-selector dark" char="Invalid"
-    extends="kb-key">
-  <script>
-    Polymer('kb-layout-selector', {
-      toLayout: 'qwerty'
-    });
-  </script>
-</polymer-element>
-
-<polymer-element name="kb-hide-keyboard-key" class="hide-keyboard dark" char="Invalid"
-    extends="kb-key">
+<polymer-element name="kb-hide-keyboard-key" class="hide-keyboard dark"
+    char="Invalid" extends="kb-key">
   <script>
     Polymer('kb-hide-keyboard-key', {
-      down: function(event) {},
+      /**
+       * Timer for a long press event which triggers the display of a keyboard
+       * options menu.
+       * @type {?Function}
+       */
+      longPressTimer: undefined,
+
+      down: function(event) {
+         var self = this;
+         this.longPressTimer = this.asyncMethod(function() {
+           if (self.longPressTimer) {
+             clearTimeout(self.longPressTimer);
+             self.longPressTimer = undefined;
+             var details = {
+               left: this.offsetLeft,
+               top: this.offsetTop,
+               width: this.clientWidth,
+             };
+             this.fire('show-options', details);
+           }
+         }, null, LONGPRESS_DELAY_MSEC);
+      },
+
       up: function(event) {
-        hideKeyboard();
+        if (this.longPressTimer) {
+          hideKeyboard();
+          this.longPressTimer = undefined;
+        }
       }
     });
   </script>
 </polymer-element>