Add support for a virtual display on ChromeOS

ui/display/chromeos/display_configurator.h

Index: ui/display/chromeos/display_configurator.h
diff --git a/ui/display/chromeos/display_configurator.h b/ui/display/chromeos/display_configurator.h
index c77b96acd7c577321319de331724aa77829e3ab6..a90da8a2f91691f14fa1dd2ae37d5718aeb50209 100644
--- a/ui/display/chromeos/display_configurator.h
+++ b/ui/display/chromeos/display_configurator.h
@@ -19,9 +19,9 @@
 #include "third_party/cros_system_api/dbus/service_constants.h"
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_constants.h"
+#include "ui/display/types/display_mode.h"
 #include "ui/display/types/native_display_observer.h"
 #include "ui/gfx/geometry/size.h"
-
 namespace gfx {
 class Point;
 class Size;
@@ -29,7 +29,6 @@ class Size;
 
 namespace ui {
 struct DisplayConfigureRequest;
-class DisplayMode;
 class DisplaySnapshot;
 class NativeDisplayDelegate;
 class UpdateDisplayConfigurationTask;
@@ -285,6 +284,14 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   bool SetColorCalibrationProfile(int64_t display_id,
                                   ui::ColorCalibrationProfile new_profile);
 
+  // Enable/disable virtual output

[achuithb, 2015/02/11 23:41:44]

period

+  void EnableVirtualDisplay(scoped_ptr<DisplayMode> display_mode);
+  void DisableVirtualDisplay();
+  bool virtual_display_enabled() { return virtual_display_mode_.get(); }

[achuithb, 2015/02/11 23:41:44]

this should be a const fn and it should be camelcase.
bool IsVirtualDisplayEnabled() const { ... }

+
+  // Find the virtual display id, returns -1 if none

[achuithb, 2015/02/11 23:41:44]

period

+  int64 GetVirtualDisplayId();
+
  private:
   class DisplayLayoutManagerImpl;
 
@@ -417,6 +424,9 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   // Whether the displays are currently suspended.
   bool displays_suspended_;
 
+  // Virtual output control

[achuithb, 2015/02/11 23:41:44]

period

+  scoped_ptr<DisplayMode> virtual_display_mode_;
+
   scoped_ptr<DisplayLayoutManager> layout_manager_;
 
   scoped_ptr<UpdateDisplayConfigurationTask> configuration_task_;