Only enable mirroring for 2 displays

chrome/browser/ui/webui/options/chromeos/display_options_handler.cc

Index: chrome/browser/ui/webui/options/chromeos/display_options_handler.cc
diff --git a/chrome/browser/ui/webui/options/chromeos/display_options_handler.cc b/chrome/browser/ui/webui/options/chromeos/display_options_handler.cc
index b6d53bebaf300001691bfd319ea097a74ebbb63b..da31e347fb564918816d89e4bcc47346010d5b0a 100644
--- a/chrome/browser/ui/webui/options/chromeos/display_options_handler.cc
+++ b/chrome/browser/ui/webui/options/chromeos/display_options_handler.cc
@@ -358,17 +358,20 @@ void DisplayOptionsHandler::SendAllDisplayInfo() {
 }
 
 void DisplayOptionsHandler::UpdateDisplaySettingsEnabled() {
+  ash::DisplayManager* display_manager = GetDisplayManager();
   bool disable_multi_display_layout =
       base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kDisableMultiDisplayLayout);
-  bool enabled = !(disable_multi_display_layout &&
-                   GetDisplayManager()->num_connected_displays() > 2);
-  bool show_unified_desktop = GetDisplayManager()->unified_desktop_enabled();
+  bool ui_enabled = display_manager->num_connected_displays() <= 2 ||
+                    !disable_multi_display_layout;
+  bool unified_enabled = display_manager->unified_desktop_enabled();
+  bool mirrored_enabled = display_manager->num_connected_displays() == 2;
 
   web_ui()->CallJavascriptFunction(
       "options.BrowserOptions.enableDisplaySettings",
-      base::FundamentalValue(enabled),
-      base::FundamentalValue(show_unified_desktop));
+      base::FundamentalValue(ui_enabled),
+      base::FundamentalValue(unified_enabled),
+      base::FundamentalValue(mirrored_enabled));
 }
 
 void DisplayOptionsHandler::HandleDisplayInfo(