PlzNavigate: Invoke didStartProvisionalLoad() when the renderer initiates a navigation in startLoad(

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 6163 matching lines @@
   if (request_params.should_clear_history_list) {
     CHECK_EQ(-1, render_view_->history_list_offset_);
     CHECK_EQ(0, render_view_->history_list_length_);
   }
 }
 
 void RenderFrameImpl::BeginNavigation(const NavigationPolicyInfo& info) {
   CHECK(IsBrowserSideNavigationEnabled());
   browser_side_navigation_pending_ = true;
 
+  didStartProvisionalLoad(frame_);
+
   // Note: At this stage, the goal is to apply all the modifications the
   // renderer wants to make to the request, and then send it to the browser, so
   // that the actual network request can be started. Ideally, all such
   // modifications should take place in willSendRequest, and in the
   // implementation of willSendRequest for the various InspectorAgents
   // (devtools).
   //
   // TODO(clamy): Apply devtools override.
   // TODO(clamy): Make sure that navigation requests are not modified somewhere
   // else in blink.
@@ skipping 619 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