From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Shelley Vohr <shelley.vohr@gmail.com>
Date: Tue, 31 Mar 2020 14:32:33 -0700
Subject: fix: undo redo broken in webviews

When propagating the undo and redo events from the menu, Chromium was not
properly sending the events to the focused webcontents on macOS. This fixes
that error. A crbug has been opened at https://bugs.chromium.org/p/chromium/issues/detail?id=1067284
and this patch will be removed when it has been resolved upstream.

diff --git a/content/browser/renderer_host/render_widget_host_view_mac.mm b/content/browser/renderer_host/render_widget_host_view_mac.mm
index 9fe6d55cc0dbcc504cdf0eebe71899887de31b19..ef464a68a9925ecef869415ed8ba1c361448b93f 100644
--- a/content/browser/renderer_host/render_widget_host_view_mac.mm
+++ b/content/browser/renderer_host/render_widget_host_view_mac.mm
@@ -38,6 +38,7 @@
 #include "content/browser/renderer_host/render_widget_host_input_event_router.h"
 #import "content/browser/renderer_host/text_input_client_mac.h"
 #import "content/browser/renderer_host/ui_events_helper.h"
+#include "content/browser/web_contents/web_contents_impl.h"
 #include "content/common/text_input_state.h"
 #include "content/common/view_messages.h"
 #include "content/public/browser/browser_context.h"
@@ -978,7 +979,12 @@ gfx::Range RenderWidgetHostViewMac::ConvertCharacterRangeToCompositionRange(
 }
 
 WebContents* RenderWidgetHostViewMac::GetWebContents() {
-  return WebContents::FromRenderViewHost(RenderViewHost::From(host()));
+  auto* wc = WebContents::FromRenderViewHost(RenderViewHost::From(host()));
+  if (wc) {
+    WebContentsImpl* web_contents_impl = static_cast<WebContentsImpl*>(wc);
+    return web_contents_impl->GetFocusedWebContents();
+  }
+  return wc;
 }
 
 bool RenderWidgetHostViewMac::GetCachedFirstRectForCharacterRange(