Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components/polymer/src/lib/expr/style-protector.html

Index: third_party/polymer/v0_8/components/polymer/src/lib/expr/style-protector.html
diff --git a/third_party/polymer/v0_8/components/polymer/src/lib/expr/style-protector.html b/third_party/polymer/v0_8/components/polymer/src/lib/expr/style-protector.html
new file mode 100644
index 0000000000000000000000000000000000000000..3a72b4a53b6c34baa9bb62ed361b2723f7c82882
--- /dev/null
+++ b/third_party/polymer/v0_8/components/polymer/src/lib/expr/style-protector.html
@@ -0,0 +1,52 @@
+<link rel="import" href="../lib/x-style.html">
+<script>
+(function() {
+
+  var transformer = document.createElement('style', 'x-style');
+
+  var styleProtector = {
+
+    scopeDocumentSheets: function() {
+      this.scopeSheets(this.getSheetsToScope());
+    },
+    
+    getSheetsToScope: function() {
+      var s$ = document.styleSheets;
+      return Array.prototype.filter.call(s$, function(s) {
+        return s.ownerNode.hasAttribute(this.SCOPE_ATTR);
+      }, this);
+    },
+
+    scopeSheets: function(sheets) {
+      for (var i=0, l=sheets.length, s; (i<l) && (s=sheets[i]); i++) {
+        this.scopeSheet(s);
+      }
+    },
+
+    scopeSheet: function(sheet) {
+      var owner = sheet.ownerNode;
+      var cssText = transformer.scopeCssText(this.rulesToCss(sheet.cssRules));
+      if (owner.localName === 'link') {
+        var style = document.createElement('style');
+        style.textContent = cssText;
+        owner.parentNode.insertBefore(style, owner);
+        owner.parentNode.removeChild(owner);
+      } else {
+        owner.textContent = cssText;
+      }
+    },
+
+    rulesToCss: function(cssRules) {
+      for (var i=0, css=[]; i < cssRules.length; i++) {
+        css.push(cssRules[i].cssText);
+      }
+      return css.join('\n\n');
+    },
+
+    SCOPE_ATTR: 'needs-scoping'
+  };
+
+  addEventListener('DOMContentLoaded', styleProtector.scopeDocumentSheets());
+
+})();
+</script>