fix: Avoid crashing in NativeViewHost::SetParentAccessible on Windows 10 (#26951)

* fix: Avoid crashing in NativeViewHost::SetParentAccessible on Windows

This fixes #26905. The patch was obtained from @deepak1556, who in turn
got it from the Microsoft Teams folks.

I believe the crash started happening due to the changes in
https://chromium.googlesource.com/chromium/src.git/+/5c6c8e994bce2bfb867279ae5068e9f9134e70c3%5E!/#F15

This affects Electron 9 and later.

Notes: Fix occasional crash on Windows

* update patches

Co-authored-by: Biru Mohanathas <[email protected]>
Co-authored-by: Electron Bot <[email protected]>

patches/chromium/.patches

@@ -106,3 +106,4 @@ cherry-pick-8f5a08079948.patch
 cherry-pick-275865e8c237.patch
 use_public_apis_to_determine_if_a_font_is_a_system_font_in_mas_build.patch
 cherry-pick-47e21abe349a.patch
+fix_setparentacessibile_crash_win.patch

patches/chromium/fix_setparentacessibile_crash_win.patch

@@ -0,0 +1,28 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Biru Mohanathas <[email protected]>
+Date: Thu, 10 Dec 2020 19:02:37 +0200
+Subject: fix crash in NativeViewHost::SetParentAccessible
+
+This fixes random crashes on Windows 10. It presumably started happening
+after the changes in
+https://chromium.googlesource.com/chromium/src.git/+/5c6c8e994bce2bfb867279ae5068e9f9134e70c3%5E!/#F15
+
+For context, see: https://github.com/electron/electron/issues/26905
+
+This patch can likely be upstreamed. The crash cannot be fixed without
+patching something in Chromium - this is the least invasive change.
+
+diff --git a/ui/views/controls/native/native_view_host.cc b/ui/views/controls/native/native_view_host.cc
+index d8e5cf4ddb625519863837544c2f91b4e015029b..e1c2e2e41eed722a7989bc8e97e2ea73119b1f70 100644
+--- a/ui/views/controls/native/native_view_host.cc
++++ b/ui/views/controls/native/native_view_host.cc
+@@ -54,6 +54,9 @@ void NativeViewHost::Detach() {
+ }
+ 
+ void NativeViewHost::SetParentAccessible(gfx::NativeViewAccessible accessible) {
++  if (!native_wrapper_.get())
++    return;
++
+   native_wrapper_->SetParentAccessible(accessible);
+ }
+