Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/lib/debounce.html

Index: third_party/polymer/v0_8/components/polymer/src/lib/debounce.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/lib/debounce.html b/third_party/polymer/v0_8/components/polymer/src/lib/debounce.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
+-->
+<script>
+
+Polymer.Debounce = (function() {
+  
+  // usage
+  
+  // invoke cb.call(this) in 100ms, unless the job is re-registered,
+  // which resets the timer
+  // 
+  // this.job = this.debounce(this.job, cb, 100)
+  //
+  // returns a handle which can be used to re-register a job
+
+  var Async = Polymer.Async;
+  
+  var Debouncer = function(context) {
+    this.context = context;
+    this.boundComplete = this.complete.bind(this);
+  };
+  
+  Debouncer.prototype = {
+    go: function(callback, wait) {
+      var h;
+      this.finish = function() {
+        Async.cancel(h);
+      };
+      h = Async.run(this.boundComplete, wait);
+      this.callback = callback;
+    },
+    stop: function() {
+      if (this.finish) {
+        this.finish();
+        this.finish = null;
+      }
+    },
+    complete: function() {
+      if (this.finish) {
+        this.stop();
+        this.callback.call(this.context);
+      }
+    }
+  };
+
+  function debounce(debouncer, callback, wait) {
+    if (debouncer) {
+      debouncer.stop();
+    } else {
+      debouncer = new Debouncer(this);
+    }
+    debouncer.go(callback, wait);
+    return debouncer;
+  }
+  
+  // exports 
+
+  return debounce;
+  
+})();
+
+</script>