From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <sattard@salesforce.com>
Date: Mon, 6 Jun 2022 14:25:15 -0700
Subject: fix: allow guest webcontents to enter fullscreen

This can be upstreamed, a guest webcontents can't technically become the focused webContents. This DCHECK should allow all guest webContents to request fullscreen entrance.

diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index c59a5dafe25831e55a36958f3d3d0765af720ca4..8982a2a4d2be23e56472b17e9d59e289e8255336 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -3429,7 +3429,7 @@ void WebContentsImpl::EnterFullscreenMode(
   OPTIONAL_TRACE_EVENT0("content", "WebContentsImpl::EnterFullscreenMode");
   DCHECK(CanEnterFullscreenMode(requesting_frame, options));
   DCHECK(requesting_frame->IsActive());
-  DCHECK(ContainsOrIsFocusedWebContents());
+  DCHECK(ContainsOrIsFocusedWebContents() || IsGuest());
 
   if (delegate_) {
     delegate_->EnterFullscreenModeForTab(requesting_frame, options);
