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

components/printing/renderer/print_web_view_helper.cc

 // Copyright (c) 2012 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/printing/renderer/print_web_view_helper.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 919 matching lines @@
     return false;
 
   // If preview is enabled, then the print dialog is tab modal, and the user
   // can always close the tab on a mis-behaving page (the system print dialog
   // is app modal). If the print was initiated through user action, don't
   // throttle. Or, if the command line flag to skip throttling has been set.
   return user_initiated || g_is_preview_enabled ||
          scripting_throttler_.IsAllowed(frame);
 }
 
-void PrintWebViewHelper::DidStartProvisionalLoad() {
+void PrintWebViewHelper::DidStartProvisionalLoad(
+    blink::WebDataSource* data_source) {
   is_loading_ = true;
 }
 
 void PrintWebViewHelper::DidFailProvisionalLoad(
     const blink::WebURLError& error) {
   DidFinishLoad();
 }
 
 void PrintWebViewHelper::DidFinishLoad() {
   is_loading_ = false;
@@ skipping 1408 matching lines @@
       blink::WebConsoleMessage::LevelWarning, message));
   return false;
 }
 
 void PrintWebViewHelper::ScriptingThrottler::Reset() {
   // Reset counter on successful print.
   count_ = 0;
 }
 
 }  // namespace printing