Reload offline version on load failure

ios/web/web_state/ui/crw_web_controller_unittest.mm

Index: ios/web/web_state/ui/crw_web_controller_unittest.mm
diff --git a/ios/web/web_state/ui/crw_web_controller_unittest.mm b/ios/web/web_state/ui/crw_web_controller_unittest.mm
index 1526b068e11234dfd68495d839e620524b93ed6d..c260ab6ab0335f390ca4e39c046374c0c11aefe7 100644
--- a/ios/web/web_state/ui/crw_web_controller_unittest.mm
+++ b/ios/web/web_state/ui/crw_web_controller_unittest.mm
@@ -889,6 +889,29 @@ TEST_F(CRWWebControllerNativeContentTest, NativeContentVirtualURL) {
             virtual_url);
 }
 
+// Tests WebState and NavigationManager correctly return native content URL.
+TEST_F(CRWWebControllerNativeContentTest, FallbackNativeContentURL) {
+  GURL url_to_load(kTestURLString);
+  GURL fallback_url(kTestAppSpecificURL);
+  base::scoped_nsobject<TestNativeContent> content([[TestNativeContent alloc]
+      initWithURL:fallback_url
+       virtualURL:url_to_load]);
+  [mock_native_provider_ setController:content forURL:fallback_url];
+  Load(url_to_load);
+  web::URLVerificationTrustLevel trust_level = web::kNone;
+  [web_controller() loadNativeContentFallback:fallback_url];
+  GURL gurl = [web_controller() currentURLWithTrustLevel:&trust_level];
+  EXPECT_EQ(web::kAbsolute, trust_level);
+  EXPECT_EQ([web_controller() webState]->GetVisibleURL(), url_to_load);
+  NavigationManagerImpl& navigationManager =
+      [web_controller() webStateImpl]->GetNavigationManagerImpl();
+  EXPECT_EQ(navigationManager.GetVisibleItem()->GetURL(), url_to_load);
+  EXPECT_EQ(navigationManager.GetVisibleItem()->GetVirtualURL(), url_to_load);
+  EXPECT_EQ(navigationManager.GetLastCommittedItem()->GetURL(), url_to_load);
+  EXPECT_EQ(navigationManager.GetLastCommittedItem()->GetVirtualURL(),
+            url_to_load);
+}
+
 // A separate test class, as none of the |CRWUIWebViewWebControllerTest| setup
 // is needed;
 typedef web::WebTestWithWebController CRWWebControllerObserversTest;