Implement PointerEvent#dx

sky/examples/example-scaffold.sky

Index: sky/examples/example-scaffold.sky
diff --git a/sky/examples/example-scaffold.sky b/sky/examples/example-scaffold.sky
index 553d1c7e01ce3c4f1c1c405e2314ad0c7b1c4c62..f5ad0a0ba9a72f8c627384b8517d619138702099 100644
--- a/sky/examples/example-scaffold.sky
+++ b/sky/examples/example-scaffold.sky
@@ -17,18 +17,21 @@
     }
     sky-drawer {
       position: absolute;
-      z-index: 1;
+      z-index: 2;
       top: 0;
       left: 0;
       bottom: 0;
       right: 0;
     }
     sky-toolbar {
+      position: relative;
+      z-index: 1;
       display: flex;
       align-items: center;
-      background-color: #526E9C;
+      background-color: #607D8A;
       color: white;
       height: 56px;
+      box-shadow: 0px 2px 4px gray;
     }
     #menu {
       display: flex;
@@ -47,7 +50,7 @@
     }
     sky-scrollable {
       flex: 1;
-      background-color: green;
+      background-color: #E7E7E7;
     }
   </style>
   <sky-drawer id="drawer">