Update to CEF 88.2.1

- Added  xlib error handlers to the "interface" unit in the Lazarus demos for Linux.
- Added the "broker" CEF process type.
- Add the Zygote process to all the MustCreate* functions in TCefApplicationCore

demos/Lazarus_Linux/SubProcess/interfaces.pas

@@ -15,11 +15,29 @@ uses
  {$IFNDEF EnableLibOverlay}
  gtk2DisableLibOverlay,
  {$ENDIF}
- Gtk2Int, Forms;
+ Gtk2Int, Forms, xlib;
+
+function CustomX11ErrorHandler(Display:PDisplay; ErrorEv:PXErrorEvent):longint;cdecl;
+begin
+  {$IFDEF DEBUG}
+  XError := ErrorEv^.error_code;
+  WriteLn('Error: ' + IntToStr(XError));
+  {$ENDIF}
+  Result := 0;
+end;
+
+function CustomXIOErrorHandler(Display:PDisplay):longint;cdecl;
+begin
+  Result := 0;
+end;
 
 procedure CustomWidgetSetInitialization;
 begin
   CreateWidgetset(TGtk2WidgetSet);
+  // Install xlib error handlers so that the application won't be terminated
+  // on non-fatal errors. Must be done after initializing GTK.
+  XSetErrorHandler(@CustomX11ErrorHandler);
+  XSetIOErrorHandler(@CustomXIOErrorHandler);
 end;
 
 procedure CustomWidgetSetFinalization;