Reading List: Mark entry read when opening external app.

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 3047 matching lines @@
   // If the URL doesn't look like one we can show, try to open the link with an
   // external application.
   // TODO(droger):  Check transition type before opening an external
   // application? For example, only allow it for TYPED and LINK transitions.
   if (![CRWWebController webControllerCanShow:requestURL]) {
     if (![self shouldOpenExternalURLForNavigationAction:action]) {
       return NO;
     }
 
     // Stop load if navigation is believed to be happening on the main frame.
-    if ([self isMainFrameNavigationAction:action])
+    if ([self isMainFrameNavigationAction:action]) {
+      [_delegate currentNavigationWillContinueInExternalApp];
       [self stopLoading];
+    }
 
     // Purge web view if last committed URL is different from the document URL.
     // This can happen if external URL was added to the navigation stack and was
     // loaded using Go Back or Go Forward navigation (in which case document URL
     // will point to the previous page).  If this is the first load for a
     // NavigationManager, there will be no last committed item, so check here.
     web::NavigationItem* lastCommittedItem =
         self.webState->GetNavigationManager()->GetLastCommittedItem();
     if (lastCommittedItem) {
       GURL lastCommittedURL = lastCommittedItem->GetURL();
@@ skipping 2007 matching lines @@
 - (void)simulateLoadRequestWithURL:(const GURL&)URL {
   _lastRegisteredRequestURL = URL;
   _loadPhase = web::LOAD_REQUESTED;
 }
 
 - (NSString*)referrerFromNavigationAction:(WKNavigationAction*)action {
   return [action.request valueForHTTPHeaderField:kReferrerHeaderName];
 }
 
 @end