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);
 
+bool IsNativeDisplay(ui::DisplayConnectionType type);

[Daniel Erat, 2015/02/23 23:14:54]

add a comment. also, i think it's confusing to use "Native" here. in other
contexts, like ui/gfx/native_widget_types.h, "native" means platform-specific. i
think that something like IsPhysicalDisplay() or IsRealDisplay() would be more
appropriate here.

[robert.bradford, 2015/03/03 19:58:00]

Done. Moved to IsPhysicalDisplayType() with an appropriate comment as. The Type
suffix as it does not take a display but instead the connection type.

+
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_DISPLAY_UTIL_H_