[Navigation Experiment] Add WKBasedNavigationManagerImpl.

ios/web/web_state/ui/crw_web_controller.mm

 // Copyright 2012 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/web_state/ui/crw_web_controller.h"
 
 #import <WebKit/WebKit.h>
 
 #import <objc/runtime.h>
 #include <stddef.h>
@@ skipping 70 matching lines @@
 #import "ios/web/web_state/error_translation_util.h"
 #import "ios/web/web_state/js/crw_js_plugin_placeholder_manager.h"
 #import "ios/web/web_state/js/crw_js_post_request_loader.h"
 #import "ios/web/web_state/js/crw_js_window_id_manager.h"
 #import "ios/web/web_state/navigation_context_impl.h"
 #import "ios/web/web_state/page_viewport_state.h"
 #import "ios/web/web_state/ui/crw_context_menu_controller.h"
 #import "ios/web/web_state/ui/crw_swipe_recognizer_provider.h"
 #import "ios/web/web_state/ui/crw_web_controller.h"
 #import "ios/web/web_state/ui/crw_web_controller_container_view.h"
+#import "ios/web/web_state/ui/crw_web_view_navigation_proxy.h"
 #import "ios/web/web_state/ui/crw_web_view_proxy_impl.h"
 #import "ios/web/web_state/ui/crw_wk_navigation_states.h"
 #import "ios/web/web_state/ui/crw_wk_script_message_router.h"
 #import "ios/web/web_state/ui/wk_back_forward_list_item_holder.h"
 #import "ios/web/web_state/ui/wk_web_view_configuration_provider.h"
 #import "ios/web/web_state/web_controller_observer_bridge.h"
 #import "ios/web/web_state/web_state_impl.h"
 #import "ios/web/web_state/web_view_internal_creation_util.h"
 #import "ios/web/web_state/wk_web_view_security_util.h"
 #import "ios/web/webui/crw_web_ui_manager.h"
@@ skipping 1317 matching lines @@
   // necessary; this creates _containerView if it doesn't exist.
   [self triggerPendingLoad];
   DCHECK(_containerView);
   return _containerView;
 }
 
 - (id<CRWWebViewProxy>)webViewProxy {
   return _webViewProxy.get();
 }
 
+- (id<CRWWebViewNavigationProxy>)webViewNavigationProxy {
+  if ([self.webView conformsToProtocol:@protocol(CRWWebViewNavigationProxy)]) {

[Eugene But (OOO till 7-30), 2017/06/30 00:59:53]

Sorry, should have mentioned in the previous round. Should this be a DCHECK
instead?

DCHECK(!self.webView || [self.webView
conformsToProtocol:@protocol(CRWWebViewNavigationProxy)]);

[danyao, 2017/06/30 14:51:43]

Done.

+    return static_cast<id<CRWWebViewNavigationProxy>>(self.webView);
+  }
+  return nil;
+}
+
 - (UIView*)viewForPrinting {
   // Printing is not supported for native controllers.
   return _webView;
 }
 
 - (double)loadingProgress {
   return [_webView estimatedProgress];
 }
 
 - (std::unique_ptr<web::NavigationContextImpl>)registerLoadRequestForURL:
@@ skipping 3763 matching lines @@
 - (NSUInteger)observerCount {
   DCHECK_EQ(_observerBridges.size(), [_observers count]);
   return [_observers count];
 }
 
 - (NSString*)referrerFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:kReferrerHeaderName];
 }
 
 @end