Fix typos in sky-drawer and sky-scrollable

sky/framework/sky-drawer.sky

 <!--
 // Copyright 2015 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.
 -->
 <import src="sky-element.sky" />
 <import src="sky-scrollable.sky" />
 
 <sky-element>
 <template>
@@ skipping 46 matching lines @@
     _animation = new AnimationController(this);
 
     addEventListener('pointerdown', _handlePointerDown);
     addEventListener('pointermove', _handlePointerMove);
     addEventListener('pointerup', _handlePointerUp);
     addEventListener('pointercancel', _handlePointerCancel);
   }
 
   void shadowRootReady() {
     _mask = shadowRoot.getElementById('mask');
-    _mask.addEventListener('click', _handleMaskClick);
+    _mask.addEventListener('gesturetap', _handleMaskTap);
     _content = shadowRoot.getElementById('content');
     _content.addEventListener('gestureflingstart', _handleFlingStart);
     position = -_kWidth;
   }
 
   void toggle() {
     if (isMostlyClosed)
       open();
     else
       close();
@@ skipping 34 matching lines @@
       begin: currentPosition,
       end: targetPosition,
       duration: math.max(_kMinAnimationDurationMS, duration),
       curve: _kAnimationCurve);
   }
 
   void updateAnimation(double p) {
     position = p;
   }
 
-  void _handleMaskClick(_) {
+  void _handleMaskTap(_) {
     close();
   }
 
   void _handlePointerDown(_) {
     _animation.stop();
   }
 
   void _handlePointerMove(PointerEvent event) {
     position += event.dx;
   }
@@ skipping 21 matching lines @@
       begin: currentPosition,
       end: targetPosition,
       duration: duration,
       curve: linear);
   }
 }
 
 _init(script) => register(script, SkyDrawer);
 </script>
 </sky-element>