do readOnly check for configured properties where they are handed dow…

…n, rather than when they are consumed.

src/standard/configure.html

@@ -69,7 +69,10 @@
 
     // at configure time values are stored in _config
     _configValue: function(name, value) {
-      this._config[name] = value;
+      var info = this._propertyInfo[name];
+      if (!info || !info.readOnly) {
+        this._config[name] = value;
+      }
     },
 
     // Override polymer-mini thunk
@@ -98,7 +101,7 @@
       // there are some test issues.
       //this._configureProperties(this._propertyInfo, config);
       // override local configuration with configuration from above
-      this._mixinConfigure(config, this._aboveConfig);
+      this.mixin(config, this._aboveConfig);
       // this is the new _config, which are the final values to be applied
       this._config = config;
       // pass configuration data to bindings
@@ -122,15 +125,6 @@
       }
     },
 
-    _mixinConfigure: function(a, b) {
-      for (var prop in b) {
-        var info = this._propertyInfo[prop];
-        if (!info || !info.readOnly) {
-          a[prop] = b[prop];
-        }
-      }
-    },
-
     // distribute config values to bound nodes.
     _distributeConfig: function(config) {
       var fx$ = this._propertyEffects;