Update Polymer from 1.2.1 -> 1.2.3

third_party/polymer/v1_0/components-chromium/paper-card/paper-card-extracted.js

 Polymer({
 
     is: 'paper-card',
 
     properties: {
 
       /**
        * The title of the card.
        */
       heading: {
         type: String,
         value: '',
         observer: '_headingChanged'
       },
 
       /**
        * The url of the title image of the card.
        */
       image: {
         type: String,
         value: ''
       },
 
       /**
+       * When `true`, any change to the image url property will cause the
+       * `placeholder` image to be shown until the image is fully rendered.
+       */
+      preloadImage: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
+       * When `preloadImage` is true, setting `fadeImage` to true will cause the
+       * image to fade into place.
+       */
+      fadeImage: {
+        type: Boolean,
+        value: false
+      },
+
+      /**
        * The z-depth of the card, from 0-5.
        */
       elevation: {
         type: Number,
         value: 1,
         reflectToAttribute: true
       },
 
       /**
        * Set this to true to animate the card shadow when setting a new
@@ skipping 25 matching lines @@
       var cls = 'title-text';
       if (image)
         cls += ' over-image';
       return cls;
     },
 
     _computeAnimated: function(animatedShadow) {
       return animatedShadow;
     }
   });