chore: add patch info for setAspectRatio (#20920)

patches/chromium/feat_unset_window_aspect_ratio_on_linux.patch

@@ -3,6 +3,13 @@ From: Erick Zhao <erickzhao@github.com>
 Date: Thu, 1 Aug 2019 13:40:17 -0700
 Subject: feat: unset window aspect ratio on linux
 
+Electron has exposed methods to allow setting the aspect ratio
+for a given window, and as a part of that needed to allow users to
+reset the aspect ratio. On macOS, we can do this with existing APIs,
+but on Linux this was not possible using currently exposed APIs without
+this patch. 
+
+Upstreamed at https://chromium-review.googlesource.com/c/chromium/src/+/1895789.
 
 diff --git a/ui/base/x/x11_window.cc b/ui/base/x/x11_window.cc
 index 7df0a3a8ed268e9b2ca1bad8ac5fd35115b98f77..a895defd2b695e2d5b2b4324551adcaac487f588 100644