Use `_clientsReadied` to avoid missing attribute->property sets in re…

…ady.

@@ -61,7 +61,7 @@
     },
 
     _attributeChangedImpl: function(name) {
-      var model = this._readied ? this : this._config;
+      var model = this._clientsReadied ? this : this._config;
       this._setAttributeToProperty(model, name);
     },
 

@@ -139,9 +139,19 @@
 </dom-module>
 <script>
   Polymer({
+
+    is: 'x-compose',
+
     hostAttributes: {
       attr1: 'compose'
     },
-    is: 'x-compose'
+
+    properties: {
+      prop2: String
+    },
+
+    ready: function() {
+      this.setAttribute('prop2', 'hi');
+    }
   });
 </script>

@@ -284,6 +284,7 @@
     assert.strictEqual(compose.$.basic.prop, 'compose');
     assert.equal(compose.$.basic.propChangedCount, 1);
     assert.equal(compose.$.basic.attr1ChangedCount, 1);
+    assert.equal(compose.prop2, 'hi');
   });
 
 });