Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/src/lib/x-style-extracted.js

Index: third_party/polymer/v0_8/components-chromium/polymer/src/lib/x-style-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/polymer/src/lib/x-style-extracted.js b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/x-style-extracted.js
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index 0000000000000000000000000000000000000000..885e84a81a116bf8d62f0fdb409e7fb7f66d0ae5
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+++ b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/x-style-extracted.js
@@ -0,0 +1,47 @@
+
+(function() {
+
+  Polymer({
+
+    is: 'x-style',
+    extends: 'style',
+
+    created: function() {
+      var rules = Polymer.StyleUtil.parser.parse(this.textContent);
+      this.applyProperties(rules);
+      // TODO(sorvell): since custom rules must match directly, they tend to be
+      // made with selectors like `*`.
+      // We *remove them here* so they don't apply too widely and nerf recalc.
+      // This means that normal properties mixe in rules with custom 
+      // properties will *not* apply.
+      var cssText = Polymer.StyleUtil.parser.stringify(rules);
+      this.textContent = this.scopeCssText(cssText);
+    },
+
+    scopeCssText: function(cssText) {
+      return Polymer.Settings.useNativeShadow ?
+        cssText :
+        Polymer.StyleUtil.toCssText(cssText, function(rule) {
+          Polymer.StyleTransformer.rootRule(rule);
+      });
+    },
+
+    applyProperties: function(rules) {
+      var cssText = '';
+      Polymer.StyleUtil.forEachStyleRule(rules, function(rule) {
+        if (rule.cssText.match(CUSTOM_RULE)) {
+          // TODO(sorvell): use parser.stringify, it needs an option not to
+          // strip custom properties.
+          cssText += rule.selector + ' {\n' + rule.cssText + '\n}\n';
+        }
+      });
+      if (cssText) {
+        Polymer.StyleDefaults.applyCss(cssText);
+      }
+    }
+
+  });
+
+  var CUSTOM_RULE = /--[^;{'"]*\:/;
+
+})();