service worker: Persist NavigationPreloadState

third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html

Index: third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html
diff --git a/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html b/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html
index 46b71f9110045add9985fa6d88f6a9bbbecbb3a9..8773ccae9c880624a2cd64abbfa18ca95d60cdea 100644
--- a/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html
+++ b/third_party/WebKit/LayoutTests/http/tests/serviceworker/navigation-preload/get-state.html
@@ -28,8 +28,9 @@ promise_test(t => {
     .then(r => {
         np = r.navigationPreload;
         add_completion_callback(() => r.unregister());
-        return np.getState();
+        return wait_for_state(t, r.installing, 'activated');
       })
+    .then(() => np.getState())
     .then(state => {
         expect_state(state, false, 'true', 'default state');
         return np.enable();
@@ -111,6 +112,9 @@ promise_test(t => {
         registration = r;
         add_completion_callback(() => registration.unregister());
         worker = registration.installing;
+        return wait_for_state(t, worker, 'activated');
+      })
+    .then(() => {
         // Call getState().
         return post_and_wait_for_reply(worker, 'getState');
       })