[ios] Added NavigationManager::LoadURLWithParams public API.

ios/web/navigation/navigation_manager_delegate.h

 // Copyright 2015 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.
 
 #ifndef IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_DELEGATE_H_
 #define IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_DELEGATE_H_
 
 #include <stddef.h>
 
+#import "ios/web/public/navigation_manager.h"
+
 namespace web {
 
 struct LoadCommittedDetails;
 class WebState;
 
 // Delegate for NavigationManager to hand off parts of the navigation flow.
 // TODO(stuartmorgan): See if this can be eliminated by moving more
 class NavigationManagerDelegate {
  public:
   virtual ~NavigationManagerDelegate() {}
 
   // Instructs the delegate to begin navigating to the pending entry.
   // TODO(stuartmorgan): Remove this once more navigation logic moves to
   // NavigationManagerImpl.
   virtual void NavigateToPendingEntry() = 0;
 
+  // Instructs the delegate to load the URL.
+  virtual void LoadURLWithParams(const NavigationManager::WebLoadParams&) = 0;
+
   // Informs the delegate that committed navigation items have been pruned.
   virtual void OnNavigationItemsPruned(size_t pruned_item_count) = 0;
 
   // Informs the delegate that a navigation item has been changed.
   virtual void OnNavigationItemChanged() = 0;
 
   // Informs the delegate that a navigation item has been commited.
   virtual void OnNavigationItemCommitted(
       const LoadCommittedDetails& load_details) = 0;
 
   // Returns the WebState associated with this delegate.
   virtual WebState* GetWebState() = 0;
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NAVIGATION_NAVIGATION_MANAGER_DELEGATE_H_