Add support for a virtual display on ChromeOS

ui/display/chromeos/display_util.h

 // Copyright 2014 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.
 
 #ifndef UI_DISPLAY_CHROMEOS_DISPLAY_UTIL_H_
 #define UI_DISPLAY_CHROMEOS_DISPLAY_UTIL_H_
 
 #include <string>
 #include <vector>
 
 #include "ui/display/chromeos/display_configurator.h"
 #include "ui/display/types/display_constants.h"
 
 namespace ui {
 
 // Returns a string describing |state|.
 std::string DisplayPowerStateToString(chromeos::DisplayPowerState state);
 
 // Returns a string describing |state|.
 std::string MultipleDisplayStateToString(MultipleDisplayState state);
 
 // Returns the number of displays in |displays| that should be turned on, per
 // |state|.  If |display_power| is non-NULL, it is updated to contain the
 // on/off state of each corresponding entry in |displays|.
 int DISPLAY_EXPORT GetDisplayPower(
     const std::vector<DisplayConfigurator::DisplayState>& display_states,
     chromeos::DisplayPowerState state,
     std::vector<bool>* display_power);
 
+// Returns whether the DisplayConnectionType |type| is a physically connected
+// display. Currently DISPLAY_CONNECTION_TYPE_VIRTUAL and
+// DISPLAY_CONNECTION_TYPE_NETWORK return true. All other types return false.
+bool IsPhysicalDisplayType(ui::DisplayConnectionType type);
+
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_UTIL_H_