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

components/dom_distiller/content/renderer/distiller_js_render_frame_observer.cc

 // Copyright 2015 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 "components/dom_distiller/content/renderer/distiller_js_render_frame_observer.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "components/dom_distiller/content/common/distiller_page_notifier_service.mojom.h"
 #include "components/dom_distiller/content/renderer/distiller_page_notifier_service_impl.h"
 #include "content/public/renderer/render_frame.h"
 #include "mojo/public/cpp/bindings/strong_binding.h"
 #include "services/service_manager/public/cpp/interface_registry.h"
 #include "v8/include/v8.h"
 
 namespace dom_distiller {
 
 DistillerJsRenderFrameObserver::DistillerJsRenderFrameObserver(
     content::RenderFrame* render_frame,
     const int distiller_isolated_world_id)
     : RenderFrameObserver(render_frame),
       distiller_isolated_world_id_(distiller_isolated_world_id),
       is_distiller_page_(false),
       weak_factory_(this) {}
 
 DistillerJsRenderFrameObserver::~DistillerJsRenderFrameObserver() {}
 
-void DistillerJsRenderFrameObserver::DidStartProvisionalLoad() {
+void DistillerJsRenderFrameObserver::DidStartProvisionalLoad(
+    blink::WebDataSource* data_source) {
   RegisterMojoInterface();
 }
 
 void DistillerJsRenderFrameObserver::DidFinishLoad() {
   // If no message about the distilled page was received at this point, there
   // will not be one; remove the mojom::DistillerPageNotifierService from the
   // registry.
   render_frame()
       ->GetInterfaceRegistry()
       ->RemoveInterface<mojom::DistillerPageNotifierService>();
@@ skipping 26 matching lines @@
 
 void DistillerJsRenderFrameObserver::SetIsDistillerPage() {
   is_distiller_page_ = true;
 }
 
 void DistillerJsRenderFrameObserver::OnDestruct() {
   delete this;
 }
 
 }  // namespace dom_distiller