PlzNavigate: Show error pages when the navigation failed before commit

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 "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/frame_tree.h"
@@ skipping 705 matching lines @@
 
   CheckWebUIRendererDoesNotDisplayNormalURL(
       render_frame_host, navigation_request->common_params().url);
 
   render_frame_host->CommitNavigation(response, body.Pass(),
                                       navigation_request->common_params(),
                                       navigation_request->request_params());
 }
 
 // PlzNavigate
+void NavigatorImpl::FailedNavigation(FrameTreeNode* frame_tree_node,
+                                     bool has_stale_copy_in_cache,
+                                     int error_code) {
+  CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableBrowserSideNavigation));
+
+  NavigationRequest* navigation_request =
+      navigation_request_map_.get(frame_tree_node->frame_tree_node_id());
+  DCHECK(navigation_request);
+
+  // Select an appropriate renderer to show the error page.
+  RenderFrameHostImpl* render_frame_host =
+      frame_tree_node->render_manager()->GetFrameHostForNavigation(
+          *navigation_request);
+  CheckWebUIRendererDoesNotDisplayNormalURL(
+      render_frame_host, navigation_request->common_params().url);
+
+  render_frame_host->FailedNavigation(navigation_request->common_params(),
+                                      navigation_request->request_params(),
+                                      has_stale_copy_in_cache, error_code);
+}
+
+// PlzNavigate
 void NavigatorImpl::CancelNavigation(FrameTreeNode* frame_tree_node) {
   CHECK(base::CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableBrowserSideNavigation));
   navigation_request_map_.erase(frame_tree_node->frame_tree_node_id());
   if (frame_tree_node->IsMainFrame())
     navigation_data_.reset();
   // TODO(carlosk): move this cleanup into the NavigationRequest destructor once
   // we properly cancel ongoing navigations.
   frame_tree_node->render_manager()->CleanUpNavigation();
 }
@@ skipping 155 matching lines @@
         "Navigation.TimeToCommit_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_commit);
     UMA_HISTOGRAM_TIMES(
         "Navigation.TimeToURLJobStart_ExistingRenderer_BeforeUnloadDiscounted",
         time_to_network);
   }
   navigation_data_.reset();
 }
 
 }  // namespace content