PlzNavigate: update navigation only if it took place.

content/renderer/render_frame_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/renderer/render_frame_impl.h"
 
 #include <map>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 3160 matching lines @@
     }
   }
 
   NavigationStateImpl* navigation_state = static_cast<NavigationStateImpl*>(
       document_state->navigation_state());
 
   // Set the navigation start time in blink.
   datasource->setNavigationStartTime(
       ConvertToBlinkTime(navigation_state->common_params().navigation_start));
 
-  if (IsBrowserSideNavigationEnabled()) {
+  // PlzNavigate: if an actual navigation took place, inform the datasource of
+  // what happened in the browser.
+  if (IsBrowserSideNavigationEnabled() &&
+      !navigation_state->request_params()
+           .navigation_timing.fetch_start.is_null()) {
     // Set timing of several events that happened during navigation.
     // They will be used in blink for the Navigation Timing API.
     double redirect_start = ConvertToBlinkTime(
         navigation_state->request_params().navigation_timing.redirect_start);
     double redirect_end = ConvertToBlinkTime(
         navigation_state->request_params().navigation_timing.redirect_end);
     double fetch_start = ConvertToBlinkTime(
         navigation_state->request_params().navigation_timing.fetch_start);
     std::vector<GURL> redirectChain =
         navigation_state->request_params().redirects;
@@ skipping 3218 matching lines @@
   // event target. Potentially a Pepper plugin will receive the event.
   // In order to tell whether a plugin gets the last mouse event and which it
   // is, we set |pepper_last_mouse_event_target_| to null here. If a plugin gets
   // the event, it will notify us via DidReceiveMouseEvent() and set itself as
   // |pepper_last_mouse_event_target_|.
   pepper_last_mouse_event_target_ = nullptr;
 #endif
 }
 
 }  // namespace content