Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/iron-icon/iron-icon-extracted.js

+
+
+  Polymer({
+
+    is: 'iron-icon',
+
+    properties: {
+
+      icon: {
+        type: String,
+        //value: '',
+        observer: '_iconChanged'
+      },
+
+      theme: {
+        type: String,
+        //value: '',
+        observer: '_updateIcon'
+      },
+
+      src: {
+        type: String,
+        //value: '',
+        observer: '_srcChanged'
+      }
+
+    },
+
+    _DEFAULT_ICONSET: 'icons',
+
+    _iconChanged: function(icon) {
+      var parts = (icon || '').split(':');
+      this._iconName = parts.pop();
+      this._iconsetName = parts.pop() || this._DEFAULT_ICONSET;
+      this._updateIcon();
+    },
+
+    _srcChanged: function(src) {
+      this._updateIcon();
+    },
+
+    _usesIconset: function() {
+      return this.icon || !this.src;
+    },
+
+    _updateIcon: function() {
+      if (this._usesIconset()) {
+        this._iconset =  this.$.meta.byKey(this._iconsetName);
+        if (this._iconset) {
+          this._iconset.applyIcon(this, this._iconName, this.theme);
+        } else {
+          console.warn('iron-icon: could not find iconset `'
+            + this._iconsetName + '`, did you import the iconset?');
+        }
+      } else {
+        //if (this._iconset) {
+        //  this._iconset.removeIcon(this.root);
+        //}
+        if (!this._img) {
+          this._img = document.createElement('img');
+        }
+        this._img.src = this.src;
+        Polymer.dom(this.root).appendChild(this._img);
+      }
+    }
+
+  });
+