Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/src/lib/debounce-extracted.js

Index: third_party/polymer/v0_8/components-chromium/polymer/src/lib/debounce-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/polymer/src/lib/debounce-extracted.js b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/debounce-extracted.js
new file mode 100644
index 0000000000000000000000000000000000000000..d35da00d8a80c59418ad075f46d07a235eeb9d13
--- /dev/null
+++ b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/debounce-extracted.js
@@ -0,0 +1,59 @@
+
+
+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;
+  
+})();
+