fix(element binder): Ensure mappings are evaluated before attach() is

called.

Closes #1059

Author: jbdeboer

lib/core_dom/element_binder.dart

@@ -353,9 +353,11 @@ class _TaskList {
   Function onDone;
   final List _tasks = [];
   bool isDone = false;
+  int firstTask;
 
   _TaskList(this.onDone) {
     if (onDone == null) isDone = true;
+    firstTask = registerTask();
   }
 
   int registerTask() {
@@ -374,7 +376,7 @@ class _TaskList {
   }
 
   void doneRegistering() {
-    completeTask(registerTask());
+    completeTask(firstTask);
   }
 }
 

test/core_dom/compiler_spec.dart

@@ -280,6 +280,7 @@ void main() {
     describe('components', () {
       beforeEachModule((Module module) {
         module
+          ..bind(AttachWithAttr)
           ..bind(CamelCaseMapComponent)
           ..bind(IoComponent)
           ..bind(IoControllerComponent)
@@ -654,6 +655,15 @@ void main() {
           expect(logger).toEqual(['SimpleAttachComponent']);
         }));
 
+        it('should call attach after mappings have been set', async((Logger logger) {
+          _.compile('<attach-with-attr attr="a" oneway="1+1"></attach-with-attr>');
+
+          _.rootScope.apply();
+          microLeap();
+
+          expect(logger).toEqual(['attr', 'oneway', 'attach']);
+        }));
+
         it('should inject compenent element as the dom.Element', async((Logger log, TestBed _, MockHttpBackend backend) {
           backend.whenGET('foo.html').respond('<div>WORKED</div>');
           _.compile('<log-element></log-element>');
@@ -1205,6 +1215,19 @@ class SimpleAttachComponent implements AttachAware, ShadowRootAware {
   onShadowRoot(_) => logger('onShadowRoot');
 }
 
+@Decorator(
+    selector: 'attach-with-attr'
+)
+class AttachWithAttr implements AttachAware {
+  Logger logger;
+  AttachWithAttr(this.logger);
+  attach() => logger('attach');
+  @NgAttr('attr')
+  set attr(v) => logger('attr');
+  @NgOneWay('oneway')
+  set oneway(v) => logger('oneway');
+}
+
 @Component(
     selector: 'log-element',
     templateUrl: 'foo.html')