title: Polymer web component content click event not firing
body: <p>I've just created my first element as a test and I'm running into an issue with an on-click event. My element is simply a button with a click event to increment a counter which is displayed as part of the button text. I've also added a content tag so you can add additional text to the button. </p>
  
  <p>When I go to click the button in Chrome, if I click on the content text, the click event isn't fired. I have to actually click on the button element / the count in the button to fire the event. All seems to be working properly though in Firefox, Safari and Opera. I can click anywhere on the button in those browsers and the click event will fire. Am I doing something wrong? Is this just a bug with Chrome? Here is my code:</p>
  
  <p><strong>index.html</strong></p>
  
  <pre><code>&lt;!DOCTYPE html&gt;
  &lt;html&gt;
  &lt;head&gt;
      &lt;title&gt;Test Element&lt;/title&gt;
      &lt;script src="bower_components/platform/platform.js"&gt;&lt;/script&gt;
      &lt;link rel="import" href="elements/my-counter.html"&gt;
  &lt;/head&gt;
  &lt;body unresolved touch-action="auto"&gt;
      &lt;my-counter count=5&gt;Times a Day&lt;/my-counter&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>
  
  <p><strong>elements/my-counter.html</strong></p>
  
  <pre><code>&lt;link rel="import" href="../bower_components/polymer/polymer.html"&gt;
  
  &lt;polymer-element name="my-counter" attributes="count"&gt;
      &lt;template&gt;
          &lt;button on-click="{{increment}}"&gt;{{ count }} &lt;content&gt;&lt;/content&gt;&lt;/button&gt;
      &lt;/template&gt;
      &lt;script&gt;
      Polymer('my-counter', {
          count: 0,
          increment: function(event, detail, sender) {
              console.log(event, detail, sender);
              ++this.count;
          }
      });
      &lt;/script&gt;
  &lt;/polymer-element&gt;
  </code></pre>
  
  <p>This code is also on GitHub if you would like to download it and test it yourself: <a href="https://github.com/andersryanc/playing-with-polymer/tree/master/my-counter" rel="nofollow">https://github.com/andersryanc/playing-with-polymer/tree/master/my-counter</a></p>