Update all Angular libs (run update_all.sh).

third_party/pkg/angular/example/web/animation/css_demo.dart

+part of animation;
+
+@Component(
+    selector: 'css-demo',
+    template: '''
+      <div class="css-demo">
+        <button ng-click="ctrl.stateA = !ctrl.stateA"
+            ng-class="{'active': ctrl.stateA}">
+            Toggle A</button>
+        <button ng-click="ctrl.stateB = !ctrl.stateB"
+            ng-class="{'active': ctrl.stateB}">
+            Toggle B</button>
+        <button ng-click="ctrl.stateC = !ctrl.stateC"
+            ng-class="{'active': ctrl.stateC}">
+            Toggle C</button>
+        <div class="box-container">
+          <div class="css-box" ng-class="{
+            'a': ctrl.stateA,
+            'b': ctrl.stateB,
+            'c': ctrl.stateC}">BOX</div>
+          </div>
+        </div>
+      </div>
+    ''',
+    publishAs: 'ctrl',
+    applyAuthorStyles: true)
+class CssDemo {
+  bool stateA = false;
+  bool stateB = false;
+  bool stateC = false;
+}