fix(html_adapter): Implement hasAttribute and getAttribute.

Fixes the template compiler when running on the server.

modules/angular2/src/dom/html_adapter.dart

@@ -13,7 +13,7 @@ class Html5LibDomAdapter implements DomAdapter {
   hasProperty(element, String name) {
     // This is needed for serverside compile to generate the right getters/setters.
     // TODO: change this once we have property schema support.
-    // Attention: Keep this in sync with browser_adapter.dart! 
+    // Attention: Keep this in sync with browser_adapter.dart!
     return true;
   }
 
@@ -235,10 +235,14 @@ class Html5LibDomAdapter implements DomAdapter {
     return map;
   }
   hasAttribute(element, String attribute) {
-    throw 'not implemented';
+    // `attributes` keys can be {@link AttributeName}s.
+    return element.attributes.keys.any((key) => '$key' == attribute);
   }
   getAttribute(element, String attribute) {
-    throw 'not implemented';
+    // `attributes` keys can be {@link AttributeName}s.
+    var key = element.attributes.keys.firstWhere(
+        (key) => '$key' == attribute, orElse: () {});
+    return element.attributes[key];
   }
   setAttribute(element, String name, String value) {
     element.attributes[name] = value;

modules/angular2/test/dom/html5lib_adapter.server.spec.dart

@@ -16,5 +16,19 @@ main() {
     it('should parse HTML', () {
       expect(subject.parse('<div>hi</div>'), isNotNull);
     });
+
+    it('implements hasAttribute', () {
+      var div = subject.querySelector(
+          subject.parse('<div foo="bar"></div>'), ('div'));
+      expect(subject.hasAttribute(div, 'foo')).toBeTrue();
+      expect(subject.hasAttribute(div, 'bar')).toBeFalse();
+    });
+
+    it('implements getAttribute', () {
+      var div = subject.querySelector(
+          subject.parse('<div foo="bar"></div>'), ('div'));
+      expect(subject.getAttribute(div, 'foo')).toEqual('bar');
+      expect(subject.getAttribute(div, 'bar')).toBe(null);
+    });
   });
 }