Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/lib/event-api.html

Index: third_party/polymer/v0_8/components/polymer/src/lib/event-api.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/lib/event-api.html b/third_party/polymer/v0_8/components/polymer/src/lib/event-api.html
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+<!--
+@license
+Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+-->
+<link rel="import" href="settings.html">
+<script>
+
+  Polymer.EventApi = (function() {
+
+    var Settings = Polymer.Settings;
+
+    var EventApi = function(event) {
+      this.event = event;
+    };
+
+    if (Settings.useShadow) {
+
+      EventApi.prototype = {
+        
+        get rootTarget() {
+          return this.event.path[0];
+        },
+
+        get localTarget() {
+          return this.event.target;
+        },
+
+        get path() {
+          return this.event.path;
+        }
+
+      };
+
+    } else {
+
+      EventApi.prototype = {
+      
+        get rootTarget() {
+          return this.event.target;
+        },
+
+        get localTarget() {
+          var current = this.event.currentTarget;
+          var currentRoot = current && Polymer.dom(current).getOwnerRoot();
+          var p$ = this.path;
+          for (var i=0; i < p$.length; i++) {
+            if (Polymer.dom(p$[i]).getOwnerRoot() === currentRoot) {
+              return p$[i];
+            }
+          }
+        },
+
+        // TODO(sorvell): simulate event.path. This probably incorrect for
+        // non-bubbling events.
+        get path() {
+          if (!this.event._path) {
+            var path = [];
+            var o = this.rootTarget;
+            while (o) {
+              path.push(o);
+              o = Polymer.dom(o).parentNode || o.host;
+            }
+            // event path includes window in most recent native implementations
+            path.push(window);
+            this.event._path = path;
+          }
+          return this.event._path;
+        }
+
+      };
+
+    }
+
+    var factory = function(event) {
+      if (!event.__eventApi) {
+        event.__eventApi = new EventApi(event);
+      }
+      return event.__eventApi;
+    };
+
+    return {
+      factory: factory
+    };
+
+  })();
+
+</script>