Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/paper-card/paper-card-extracted.js

Index: third_party/polymer/v0_8/components-chromium/paper-card/paper-card-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/paper-card/paper-card-extracted.js b/third_party/polymer/v0_8/components-chromium/paper-card/paper-card-extracted.js
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index 0000000000000000000000000000000000000000..4bd2b3e24c136f6b994778c60178e9cbaa14097e
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+++ b/third_party/polymer/v0_8/components-chromium/paper-card/paper-card-extracted.js
@@ -0,0 +1,38 @@
+
+  Polymer({
+    is: 'paper-card',
+
+    enableCustomStyleProperties: true,
+
+    properties: {
+
+      /**
+       * The z-depth of this card, from 0-5. Setting to 0 will remove the
+       * shadow, and each increasing number greater than 0 will be "deeper"
+       * than the last.
+       *
+       * @attribute elevation
+       * @type number
+       * @default 1
+       */
+      elevation: {
+        type: Number,
+        reflectToAttribute: true,
+        value: 1
+      },
+
+      /**
+       * Set this to true to animate the shadow when setting a new
+       * `elevation` value.
+       *
+       * @attribute animated
+       * @type boolean
+       * @default false
+       */
+      animated: {
+        type: Boolean,
+        reflectToAttribute: true,
+        value: false
+      }
+    }
+  });