Add support for virtual displays

ash/display/display_change_observer_chromeos.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/display/display_change_observer_chromeos.h"
 
 #include <algorithm>
 #include <map>
 #include <set>
 #include <string>
@@ skipping 200 matching lines @@
         if (size_in_vec.LengthSquared() > k2xThreshouldSizeSquaredFor4KInMm &&
             mode_info->size().width() >= kMinimumWidthFor4K) {
           // Make sure that additional device scale factors table has 2x.
           DCHECK_EQ(2.0f, kAdditionalDeviceScaleFactorsFor4k[1]);
           device_scale_factor = 2.0f;
         }
       }
     }
     gfx::Rect display_bounds(state->origin(), mode_info->size());
 
-    std::string name =
-        state->type() == ui::DISPLAY_CONNECTION_TYPE_INTERNAL
-            ? l10n_util::GetStringUTF8(IDS_ASH_INTERNAL_DISPLAY_NAME)
-            : state->display_name();
+    std::string name;
+    switch (state->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_name();
+    }
+
     if (name.empty())
       name = l10n_util::GetStringUTF8(IDS_ASH_STATUS_TRAY_UNKNOWN_DISPLAY_NAME);
 
     bool has_overscan = state->has_overscan();
     int64 id = state->display_id();
     ids.insert(id);
 
     displays.push_back(DisplayInfo(id, name, has_overscan));
     DisplayInfo& new_info = displays.back();
     new_info.set_device_scale_factor(device_scale_factor);
@@ skipping 55 matching lines @@
   }
   return 1.0f;
 }
 
 void DisplayChangeObserver::OnTouchscreenDeviceConfigurationChanged() {
   OnDisplayModeChanged(
       Shell::GetInstance()->display_configurator()->cached_displays());
 }
 
 }  // namespace ash