Polymer elements added to third_party/polymer.

third_party/polymer/components/core-dropdown/core-dropdown.css

Index: third_party/polymer/components/core-dropdown/core-dropdown.css
diff --git a/third_party/polymer/components/core-dropdown/core-dropdown.css b/third_party/polymer/components/core-dropdown/core-dropdown.css
new file mode 100644
index 0000000000000000000000000000000000000000..ea2a6e383a06520a148956c53ba46e590d0ea1e4
--- /dev/null
+++ b/third_party/polymer/components/core-dropdown/core-dropdown.css
@@ -0,0 +1,36 @@
+:host {
+  position: relative;
+  display: inline-block;
+  background-color: #fff;
+}
+
+#control core-item {
+  margin-left: 12px;
+  max-width: inherit;
+}
+
+#control core-item::shadow #label {
+  overflow: hidden;
+  /* FIXME not working for some reason */
+  white-space: nowrap;
+  text-overflow: ellipsis;
+}
+
+#arrow {
+  margin: 0 12px;
+}
+
+#menu {
+  position: absolute;
+  left: 0;
+  margin: 0;
+  padding: 0 12px;
+  overflow: scroll;
+  -webkit-overflow-scrolling: touch;
+  background-color: #fff;
+}
+
+:host([halign="right"]) #menu {
+  left: auto;
+  right: 0;
+}