Remove third_party/polymer from .gitignore

third_party/polymer/v1_0/components/neon-animation/animations/ripple-animation.html

-<!--
-@license
-Copyright (c) 2015 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="../../polymer/polymer.html">
-<link rel="import" href="../neon-shared-element-animation-behavior.html">
-<link rel="import" href="../web-animations.html">
-
-<!--
-`<ripple-animation>` scales and transform an element such that it appears to ripple from either
-a shared element, or from a screen position, to full screen.
-
-If using as a shared element animation in `<neon-animated-pages>`, use this animation in an `exit`
-animation in the source page and in an `entry` animation in the destination page. Also, define the
-hero elements in the `sharedElements` property (not a configuration property, see
-`Polymer.NeonSharedElementAnimatableBehavior`).
-
-If using a screen position, define the `gesture` property.
-
-Configuration:
-```
-{
-  name: 'ripple-animation`.
-  id: <shared-element-id>, /* set this or gesture */
-  gesture: {x: <page-x>, y: <page-y>}, /* set this or id */
-  timing: <animation-timing>,
-  toPage: <node>, /* define for the destination page */
-  fromPage: <node>, /* define for the source page */
-}
-```
--->
-
-<script>
-
-  Polymer({
-
-    is: 'ripple-animation',
-
-    behaviors: [
-      Polymer.NeonSharedElementAnimationBehavior
-    ],
-
-    configure: function(config) {
-      var shared = this.findSharedElements(config);
-      if (!shared) {
-        return null;
-      }
-
-      var translateX, translateY;
-      var toRect = shared.to.getBoundingClientRect();
-      if (config.gesture) {
-        translateX = config.gesture.x - (toRect.left + (toRect.width / 2));
-        translateY = config.gesture.y - (toRect.top + (toRect.height / 2));
-      } else {
-        var fromRect = shared.from.getBoundingClientRect();
-        translateX = (fromRect.left + (fromRect.width / 2)) - (toRect.left + (toRect.width / 2));
-        translateY = (fromRect.top + (fromRect.height / 2)) - (toRect.top + (toRect.height / 2));
-      }
-      var translate = 'translate(' + translateX + 'px,' + translateY + 'px)';
-
-      var size = Math.max(toRect.width + Math.abs(translateX) * 2, toRect.height + Math.abs(translateY) * 2);
-      var diameter = Math.sqrt(2 * size * size);
-      var scaleX = diameter / toRect.width;
-      var scaleY = diameter / toRect.height;
-      var scale = 'scale(' + scaleX + ',' + scaleY + ')';
-
-      this.setPrefixedProperty(shared.to, 'transformOrigin', '50% 50%');
-      shared.to.style.borderRadius = '50%';
-
-      this._effect = new KeyframeEffect(shared.to, [
-        {'transform': translate + ' scale(0)'},
-        {'transform': translate + ' ' + scale}
-      ], this.timingFromConfig(config));
-      return this._effect;
-    },
-
-    complete: function() {
-      if (this.sharedElements) {
-        this.setPrefixedProperty(this.sharedElements.to, 'transformOrigin', '');
-        this.sharedElements.to.style.borderRadius = '';
-      }
-    }
-
-  });
-
-</script>