electron/patches/chromium/blink_local_frame.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cheng Zhao <zcbenz@gmail.com>
Date: Thu, 20 Sep 2018 17:45:03 -0700
Subject: blink_local_frame.patch

According to electron/electron#3699, it is unreliable to use |unload|
event for process.exit('exit'), so we have to do that in
willReleaseScriptContext.

Refs changes in:
* https://codereview.chromium.org/1657583002
* https://chromium-review.googlesource.com/c/chromium/src/+/2596880
* https://chromium-review.googlesource.com/c/chromium/src/+/2597169

This patch reverts the changes to fix associated crashes in Electron.

diff --git a/third_party/blink/renderer/core/frame/frame.cc b/third_party/blink/renderer/core/frame/frame.cc
index 2670ea1361ccd8a9e3bac507e94dd25b7205ecf9..c12f78d925e4ccb4ac2fd3851a9c61e87058dc75 100644
--- a/third_party/blink/renderer/core/frame/frame.cc
+++ b/third_party/blink/renderer/core/frame/frame.cc
@@ -134,14 +134,6 @@ bool Frame::Detach(FrameDetachType type) {
 
   DCHECK(!IsDetached());
 
-  // TODO(dcheng): FocusController::FrameDetached() *should* fire JS events,
-  // hence the above check for `client_` being null. However, when this was
-  // previously placed before the `FrameDetached()` call, nothing crashes, which
-  // is suspicious. Investigate if we really don't need to fire JS events--and
-  // if we don't, move `forbid_scripts` up to be instantiated sooner and
-  // simplify this code.
-  ScriptForbiddenScope forbid_scripts;
-
   if (type == FrameDetachType::kRemove) {
     if (provisional_frame_) {
       provisional_frame_->Detach(FrameDetachType::kRemove);
@@ -166,6 +158,14 @@ bool Frame::Detach(FrameDetachType type) {
     GetWindowProxyManager()->ClearForSwap();
   }
 
+  // TODO(dcheng): FocusController::FrameDetached() *should* fire JS events,
+  // hence the above check for `client_` being null. However, when this was
+  // previously placed before the `FrameDetached()` call, nothing crashes, which
+  // is suspicious. Investigate if we really don't need to fire JS events--and
+  // if we don't, move `forbid_scripts` up to be instantiated sooner and
+  // simplify this code.
+  ScriptForbiddenScope forbid_scripts;
+
   // After this, we must no longer talk to the client since this clears
   // its owning reference back to our owning LocalFrame.
   client_->Detached(type);
diff --git a/third_party/blink/renderer/core/frame/local_frame.cc b/third_party/blink/renderer/core/frame/local_frame.cc
index 5ecfabc35eea65e17bcb13509186ac5d1db61021..cc1bccf5d168760532cc962ab7f7775e91255108 100644
--- a/third_party/blink/renderer/core/frame/local_frame.cc
+++ b/third_party/blink/renderer/core/frame/local_frame.cc
@@ -753,10 +753,6 @@ bool LocalFrame::DetachImpl(FrameDetachType type) {
   }
   DCHECK(!view_ || !view_->IsAttached());
 
-  // This is the earliest that scripting can be disabled:
-  // - FrameLoader::Detach() can fire XHR abort events
-  // - Document::Shutdown() can dispose plugins which can run script.
-  ScriptForbiddenScope forbid_script;
   if (!Client())
     return false;
 
@@ -810,6 +806,11 @@ bool LocalFrame::DetachImpl(FrameDetachType type) {
   DCHECK(!view_->IsAttached());
   Client()->WillBeDetached();
 
+  // This is the earliest that scripting can be disabled:
+  // - FrameLoader::Detach() can fire XHR abort events
+  // - Document::Shutdown() can dispose plugins which can run script.
+  ScriptForbiddenScope forbid_script;
+
   // TODO(crbug.com/729196): Trace why LocalFrameView::DetachFromLayout crashes.
   CHECK(!view_->IsAttached());
   SetView(nullptr);