Add support for a virtual display on ChromeOS

ash/display/display_change_observer_chromeos.cc

Index: ash/display/display_change_observer_chromeos.cc
diff --git a/ash/display/display_change_observer_chromeos.cc b/ash/display/display_change_observer_chromeos.cc
index de4819495d8bea21bede92f59e485684b5cdb2c2..ac666f29395db075143670fcd65b728f3a2e7adc 100644
--- a/ash/display/display_change_observer_chromeos.cc
+++ b/ash/display/display_change_observer_chromeos.cc
@@ -211,10 +211,18 @@ void DisplayChangeObserver::OnDisplayModeChanged(
     }
     gfx::Rect display_bounds(state.display->origin(), mode_info->size());
 
-    std::string name =
-        state.display->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL ?
-            l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME) :
-            state.display->display_name();
+    std::string name;
+    switch (state.display->type()) {
+      case ui::DISPLAY_CONNECTION_TYPE_INTERNAL:
+        name = l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME);
+        break;
+      case ui::DISPLAY_CONNECTION_TYPE_VIRTUAL:
+        name = l10n_util::GetStringUTF8(IDS_ASH_VIRTUAL_DISPLAY_NAME);
+        break;
+      default:
+        name = state.display->display_name();
+    }
+
     if (name.empty())
       name = l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);