Add is_srcdoc to FrameNavigationEntry and restore about::srcdoc URL.

content/browser/frame_host/navigator_impl.cc

 // Copyright 2013 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.
 
 #include "content/browser/frame_host/navigator_impl.h"
 
 #include <utility>
 
 #include "base/logging.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 874 matching lines @@
       entry = NavigationEntryImpl::FromNavigationEntry(
           controller_->CreateNavigationEntry(
               GURL(url::kAboutBlankURL), referrer_to_use, page_transition,
               is_renderer_initiated, extra_headers,
               controller_->GetBrowserContext()));
     }
     entry->AddOrUpdateFrameEntry(
         node, -1, -1, nullptr,
         static_cast<SiteInstanceImpl*>(source_site_instance),
         dest_url, referrer_to_use, redirect_chain, PageState(), method,
-        -1);
+        -1, false);
   } else {
     // Main frame case.
     entry = NavigationEntryImpl::FromNavigationEntry(
         controller_->CreateNavigationEntry(
             dest_url, referrer_to_use, page_transition, is_renderer_initiated,
             extra_headers, controller_->GetBrowserContext()));
     entry->root_node()->frame_entry->set_source_site_instance(
         static_cast<SiteInstanceImpl*>(source_site_instance));
     entry->SetRedirectChain(redirect_chain);
   }
@@ skipping 12 matching lines @@
   // We may not have successfully added the FrameNavigationEntry to |entry|
   // above (per https://crbug.com/608402), in which case we create it from
   // scratch.  This works because we do not depend on |frame_entry| being inside
   // |entry| during NavigateToEntry.  This will go away when we shortcut this
   // further in https://crbug.com/536906.
   scoped_refptr<FrameNavigationEntry> frame_entry(entry->GetFrameEntry(node));
   if (!frame_entry) {
     frame_entry = new FrameNavigationEntry(
         node->unique_name(), -1, -1, nullptr,
         static_cast<SiteInstanceImpl*>(source_site_instance), dest_url,
-        referrer_to_use, method, -1);
+        referrer_to_use, method, -1, false);
   }
   NavigateToEntry(node, *frame_entry, *entry.get(), ReloadType::NONE, false,
                   false, false, post_body);
 }
 
 // PlzNavigate
 void NavigatorImpl::OnBeforeUnloadACK(FrameTreeNode* frame_tree_node,
                                       bool proceed) {
   CHECK(IsBrowserSideNavigationEnabled());
   DCHECK(frame_tree_node);
@@ skipping 338 matching lines @@
     if (navigation_handle)
       navigation_handle->update_entry_id_for_transfer(entry->GetUniqueID());
 
     controller_->SetPendingEntry(std::move(entry));
     if (delegate_)
       delegate_->NotifyChangedNavigationState(content::INVALIDATE_TYPE_URL);
   }
 }
 
 }  // namespace content