From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <marshallofsound@electronjs.org>
Date: Thu, 9 Mar 2023 01:28:56 -0800
Subject: feat: expose DocumentLoader::SetDefersLoading on WebDocumentLoader

This allows embedders to call SetDefersLoading without reaching into Blink internals. Electron uses this to defer page loading until the preload scripts have finished executing.
This might be upstreamable?

diff --git a/third_party/blink/public/web/web_document_loader.h b/third_party/blink/public/web/web_document_loader.h
index f9d3219990dcf4f4a829567d567072df59a70ada..ca8281faaff601bf591cf5a2b185e4ba0aa32676 100644
--- a/third_party/blink/public/web/web_document_loader.h
+++ b/third_party/blink/public/web/web_document_loader.h
@@ -38,6 +38,7 @@
 #include "third_party/blink/public/platform/cross_variant_mojo_util.h"
 #include "third_party/blink/public/platform/web_archive_info.h"
 #include "third_party/blink/public/platform/web_common.h"
+#include "third_party/blink/public/platform/web_loader_freeze_mode.h"
 #include "third_party/blink/public/platform/web_source_location.h"
 #include "third_party/blink/public/web/web_navigation_type.h"
 
@@ -62,6 +63,8 @@ class BLINK_EXPORT WebDocumentLoader {
     virtual ~ExtraData() = default;
   };
 
+  virtual void SetDefersLoading(WebLoaderFreezeMode) = 0;
+
   static bool WillLoadUrlAsEmpty(const WebURL&);
 
   // Returns the http referrer of original request which initited this load.
diff --git a/third_party/blink/renderer/core/loader/document_loader.h b/third_party/blink/renderer/core/loader/document_loader.h
index be15dfe1288297782931c71567735328c6430209..3e78f23f30a7bd65cb53eedadf625baff1e66214 100644
--- a/third_party/blink/renderer/core/loader/document_loader.h
+++ b/third_party/blink/renderer/core/loader/document_loader.h
@@ -313,7 +313,7 @@ class CORE_EXPORT DocumentLoader : public GarbageCollected<DocumentLoader>,
       std::optional<scheduler::TaskAttributionId>
           soft_navigation_heuristics_task_id);
 
-  void SetDefersLoading(LoaderFreezeMode);
+  void SetDefersLoading(LoaderFreezeMode) override;
 
   DocumentLoadTiming& GetTiming() { return document_load_timing_; }