Add support for virtual displays

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>
 
@@ skipping 12 matching lines @@
 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<DisplaySnapshot*>& displays,
                 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 false. All other types return true.
+bool IsPhysicalDisplayType(ui::DisplayConnectionType type);
+
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_UTIL_H_