Import Polymer 0.8 and several key elements.

third_party/polymer/v0_8/components-chromium/polymer/src/lib/case-map-extracted.js

Index: third_party/polymer/v0_8/components-chromium/polymer/src/lib/case-map-extracted.js
diff --git a/third_party/polymer/v0_8/components-chromium/polymer/src/lib/case-map-extracted.js b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/case-map-extracted.js
new file mode 100644
index 0000000000000000000000000000000000000000..efa1ea505422cbab08dd7cb8d432f44275b2e1a7
--- /dev/null
+++ b/third_party/polymer/v0_8/components-chromium/polymer/src/lib/case-map-extracted.js
@@ -0,0 +1,36 @@
+
+
+  Polymer.CaseMap = {
+
+    _caseMap: {},
+
+    dashToCamelCase: function(dash) {
+      var mapped = Polymer.CaseMap._caseMap[dash];
+      if (mapped) {
+        return mapped;
+      }
+      // TODO(sjmiles): is rejection test actually helping perf?
+      if (dash.indexOf('-') < 0) {
+        return Polymer.CaseMap._caseMap[dash] = dash;
+      }
+      return Polymer.CaseMap._caseMap[dash] = dash.replace(/-([a-z])/g, 
+        function(m) {
+          return m[1].toUpperCase(); 
+        }
+      );
+    },
+
+    camelToDashCase: function(camel) {
+      var mapped = Polymer.CaseMap._caseMap[camel];
+      if (mapped) {
+        return mapped;
+      }
+      return Polymer.CaseMap._caseMap[camel] = camel.replace(/([a-z][A-Z])/g, 
+        function (g) { 
+          return g[0] + '-' + g[1].toLowerCase() 
+        }
+      );
+    }
+
+  };
+