Reland of Set user agent type of transient item the same as pending item

ios/web/public/test/web_test_with_web_state.mm

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "ios/web/public/test/web_test_with_web_state.h"
 
 #include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
 #import "base/test/ios/wait_util.h"
+#import "ios/web/navigation/navigation_manager_impl.h"
 #include "ios/web/public/web_state/url_verification_constants.h"
 #include "ios/web/public/web_state/web_state_observer.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 #import "ios/web/web_state/web_state_impl.h"
 
 namespace {
 // Returns CRWWebController for the given |web_state|.
 CRWWebController* GetWebController(web::WebState* web_state) {
   web::WebStateImpl* web_state_impl =
       static_cast<web::WebStateImpl*>(web_state);
@@ skipping 15 matching lines @@
 
   // Force generation of child views; necessary for some tests.
   [GetWebController(web_state()) triggerPendingLoad];
 }
 
 void WebTestWithWebState::TearDown() {
   DestroyWebState();
   WebTest::TearDown();
 }
 
+void WebTestWithWebState::AddPendingItem(const GURL& url,
+                                         ui::PageTransition transition) {
+  GetWebController(web_state())
+      .webStateImpl->GetNavigationManagerImpl()
+      .AddPendingItem(url, Referrer(), transition,
+                      web::NavigationInitiationType::USER_INITIATED,
+                      web::NavigationManager::UserAgentOverrideOption::INHERIT);
+}
+
 void WebTestWithWebState::LoadHtml(NSString* html, const GURL& url) {
   // Sets MIME type to "text/html" once navigation is committed.
   class MimeTypeUpdater : public WebStateObserver {
    public:
     explicit MimeTypeUpdater(WebState* web_state)
         : WebStateObserver(web_state) {}
     // WebStateObserver overrides:
     void NavigationItemCommitted(const LoadCommittedDetails&) override {
       // loadHTML:forURL: does not notify web view delegate about received
       // response, so web controller does not get a chance to properly update
@@ skipping 95 matching lines @@
 
 void WebTestWithWebState::WillProcessTask(const base::PendingTask&) {
   // Nothing to do.
 }
 
 void WebTestWithWebState::DidProcessTask(const base::PendingTask&) {
   processed_a_task_ = true;
 }
 
 }  // namespace web