Add paper-dropdown and paper-dropdown-menu and run reproduce.sh

third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu.html

Index: third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu.html
diff --git a/third_party/polymer/components/core-dropdown-menu/core-dropdown-menu.html b/third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu.html
similarity index 60%
copy from third_party/polymer/components/core-dropdown-menu/core-dropdown-menu.html
copy to third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu.html
index c06f4c0fcbd953fd816fd33d3c2f839ade4b7f7b..adcca1b53bc02eb19529f52a4510a89b7c4cf135 100644
--- a/third_party/polymer/components/core-dropdown-menu/core-dropdown-menu.html
+++ b/third_party/polymer/components/paper-dropdown-menu/paper-dropdown-menu.html
@@ -9,52 +9,92 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
 
 <!--
 
-`core-dropdown-menu` works together with `core-dropdown` and `core-selector` to
+`paper-dropdown-menu` works together with `paper-dropdown` and `core-menu` to
 implement a drop-down menu. The currently selected item is displayed in the
 control. If no item is selected, the `label` is displayed instead.
 
 The child element with the class `dropdown` will be used as the drop-down
-menu. It should be a `core-dropdown` or other overlay element. You should
+menu. It should be a `paper-dropdown` or other overlay element. You should
 also provide a `core-selector` or other selector element, such as `core-menu`,
-in the drop-down.
+in the drop-down. You should apply the class `menu` to the selector element.
 
 Example:
 
-    <core-dropdown-menu label="Choose a pastry">
-        <core-dropdown class="dropdown">
-            <core-selector>
-              <core-item label="Croissant"></core-item>
-              <core-item label="Donut"></core-item>
-              <core-item label="Financier"></core-item>
-              <core-item label="Madeleine"></core-item>
-            </core-selector>
-        </core-dropdown>
-    </core-dropdown-menu>
-
-@group Polymer Core Elements
-@element core-dropdown-menu
+    <paper-dropdown-menu label="Your favorite pastry">
+        <paper-dropdown class="dropdown">
+            <core-menu class="menu">
+                <paper-item>Croissant</paper-item>
+                <paper-item>Donut</paper-item>
+                <paper-item>Financier</paper-item>
+                <paper-item>Madeleine</paper-item>
+            </core-menu>
+        </paper-dropdown>
+    </paper-dropdown-menu>
+
+This example renders a drop-down menu with 4 options.
+
+@group Paper Elements
+@element paper-dropdown-menu
 @extends core-dropdown-base
 @status unstable
 @homepage github.io
 -->
 
+<!--
+Fired when an item's selection state is changed. This event is fired both
+when an item is selected or deselected. The `isSelected` detail property
+contains the selection state.
+
+@event core-select
+@param {Object} detail
+  @param {boolean} detail.isSelected true for selection and false for deselection
+  @param {Object} detail.item the item element
+-->
 <link href="../polymer/polymer.html" rel="import">
+
 <link href="../core-a11y-keys/core-a11y-keys.html" rel="import">
 <link href="../core-dropdown/core-dropdown-base.html" rel="import">
 <link href="../core-focusable/core-focusable.html" rel="import">
 <link href="../core-icon/core-icon.html" rel="import">
 <link href="../core-icons/core-icons.html" rel="import">
-
-<polymer-element name="core-dropdown-menu" extends="core-dropdown-base" relative layout inline horizontal center tabindex="0">
+<link href="../paper-shadow/paper-shadow.html" rel="import">
+
+<style shim-shadowdom>
+  html /deep/ #paper-dropdown-menu-dropdown {
+    margin: 12px;
+    overflow: visible;
+  }
+
+  html /deep/ #paper-dropdown-menu-dropdown #menu {
+    padding: 8px 0;
+    margin: 0;
+  }
+
+  html /deep/ #paper-dropdown-menu-dropdown .menu-container {
+    overflow: auto;
+    max-height: 100%;
+    max-width: 100%;
+  }
+</style>
+
+<polymer-element name="paper-dropdown-menu" extends="core-dropdown-base" relative layout inline horizontal center tabindex="0">
 <template>
 
   <style>
     :host {
-      background-color: #fff;
+      -moz-user-select: none;
+      -ms-user-select: none;
+      -webkit-user-select: none;
+      user-select: none;
+      cursor: pointer;
+      padding: 0.5em 0 0.25em;
+      margin: 0.75em 0;
+      border-bottom: 1px solid #757575;
+      outline: none;
     }
 
-    :host([disabled]) {
-      color: #a8a8a8;
+    #label, #arrow {
+      color: #757575;
     }
 
     #label {