Inline scripts were extracted from Polymer elements.

third_party/polymer/components-chromium/core-signals/core-signals-extracted.js

+
+(function(){
+  
+  Polymer('core-signals',{
+    attached: function() {
+      signals.push(this);
+    },
+    removed: function() {
+      var i = signals.indexOf(this);
+      if (i >= 0) {
+        signals.splice(i, 1);
+      }
+    }
+  });
+
+  // private shared database
+  var signals = [];
+
+  // signal dispatcher
+  function notify(name, data) {
+    // convert generic-signal event to named-signal event
+    var signal = new CustomEvent('core-signal-' + name, {
+      // if signals bubble, it's easy to get confusing duplicates
+      // (1) listen on a container on behalf of local child
+      // (2) some deep child ignores the event and it bubbles 
+      //     up to said container
+      // (3) local child event bubbles up to container
+      // also, for performance, we avoid signals flying up the
+      // tree from all over the place
+      bubbles: false,
+      detail: data
+    });
+    // dispatch named-signal to all 'signals' instances,
+    // only interested listeners will react
+    signals.forEach(function(s) {
+      s.dispatchEvent(signal);
+    });
+  }
+
+  // signal listener at document
+  document.addEventListener('core-signal', function(e) {
+    notify(e.detail.name, e.detail.data);
+  });
+  
+})();