The intial route shouldn't run its entrance animation

Instead, it should enter the world fully formed.

packages/flutter/lib/src/widgets/navigator.dart

@@ -68,9 +68,15 @@ abstract class Route<T> {
 }
 
 class NamedRouteSettings {
-  const NamedRouteSettings({ this.name, this.mostValuableKeys });
+  const NamedRouteSettings({
+    this.name,
+    this.mostValuableKeys,
+    this.isInitialRoute: false
+  });
+
   final String name;
   final Set<Key> mostValuableKeys;
+  final bool isInitialRoute;
 
   String toString() {
     String result = '"$name"';
@@ -161,7 +167,8 @@ class NavigatorState extends State<Navigator> {
     assert(config.observer == null || config.observer.navigator == null);
     config.observer?._navigator = this;
     _push(config.onGenerateRoute(new NamedRouteSettings(
-      name: config.initialRoute ?? Navigator.defaultRouteName
+      name: config.initialRoute ?? Navigator.defaultRouteName,
+      isInitialRoute: true
     )));
   }
 

packages/flutter/lib/src/widgets/pages.dart

@@ -4,6 +4,8 @@
 
 import 'dart:async';
 
+import 'package:flutter/animation.dart';
+
 import 'navigator.dart';
 import 'overlay.dart';
 import 'routes.dart';
@@ -19,6 +21,13 @@ abstract class PageRoute<T> extends ModalRoute<T> {
   bool canTransitionTo(TransitionRoute nextRoute) => nextRoute is PageRoute;
   bool canTransitionFrom(TransitionRoute nextRoute) => nextRoute is PageRoute;
 
+  Performance createPerformanceController() {
+    Performance performance = super.createPerformanceController();
+    if (settings.isInitialRoute)
+      performance.progress = 1.0;
+    return performance;
+  }
+
   // Subclasses can override this method to customize way heroes are inserted
   void insertHeroOverlayEntry(OverlayEntry entry, Object tag, OverlayState overlay) {
     overlay.insert(entry);

packages/unit/test/widget/page_forward_transitions_test.dart

@@ -28,7 +28,7 @@ class TestTransition extends TransitionComponent {
 }
 
 class TestRoute<T> extends PageRoute<T> {
-  TestRoute(this.child);
+  TestRoute({ this.child, NamedRouteSettings settings}) : super(settings: settings);
   final Widget child;
   Duration get transitionDuration => kMaterialPageRouteTransitionDuration;
   Color get barrierColor => null;
@@ -71,7 +71,8 @@ void main() {
             switch (settings.name) {
               case '/':
                 return new TestRoute(
-                  new Builder(
+                  settings: settings,
+                  child: new Builder(
                     key: insideKey,
                     builder: (BuildContext context) {
                       PageRoute route = ModalRoute.of(context);
@@ -90,30 +91,18 @@ void main() {
                     }
                   )
                 );
-              case '/2': return new TestRoute(new Text('E'));
-              case '/3': return new TestRoute(new Text('F'));
-              case '/4': return new TestRoute(new Text('G'));
+              case '/2': return new TestRoute(settings: settings, child: new Text('E'));
+              case '/3': return new TestRoute(settings: settings, child: new Text('F'));
+              case '/4': return new TestRoute(settings: settings, child: new Text('G'));
             }
           }
         )
       );
 
-      // TODO(ianh): Remove the first part of this test once the first page doesn't animate in
-
       NavigatorState navigator = insideKey.currentContext.ancestorStateOfType(NavigatorState);
 
-      expect(state(), equals('AC')); // transition ->1 is at 0.0
-
-      tester.pump(kFourTenthsOfTheTransitionDuration);
-      expect(state(), equals('AC')); // transition ->1 is at 0.4
-
-      tester.pump(kFourTenthsOfTheTransitionDuration);
-      expect(state(), equals('BC')); // transition ->1 is at 0.8
-
-      tester.pump(kFourTenthsOfTheTransitionDuration);
       expect(state(), equals('BC')); // transition ->1 is at 1.0
 
-
       navigator.openTransaction((NavigatorTransaction transaction) => transaction.pushNamed('/2'));
       expect(state(), equals('BC')); // transition 1->2 is not yet built
       tester.pump();