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 8d5cba79e4f6e17977762a0e364302035e827fd4..80b9243b4e2ce5e229b28d0b0893249e66c79942 100644
--- a/ui/display/chromeos/display_configurator.h
+++ b/ui/display/chromeos/display_configurator.h
@@ -18,6 +18,7 @@
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
 #include "third_party/cros_system_api/dbus/service_constants.h"
+#include "ui/display/chromeos/display_snapshot_virtual.h"
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_constants.h"
 #include "ui/display/types/native_display_observer.h"
@@ -289,9 +290,17 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   bool SetColorCalibrationProfile(int64_t display_id,
                                   ui::ColorCalibrationProfile new_profile);
 
+  // Enables/disables virtual display.
+  void EnableVirtualDisplay(gfx::Size display_size);
+  void DisableVirtualDisplay();
+  bool IsVirtualDisplayEnabled() const;
+
+  // Finds the virtual display id, returns gfx::Display::kInvalidDisplayID if
+  // none.
+  int64_t GetVirtualDisplayId();
+
   // static
   static DisplayConfigurator* GetInstance();
-
  private:
   friend struct DefaultSingletonTraits<DisplayConfigurator>;
   friend class ui::test::DisplayConfiguratorTest;
@@ -429,6 +438,9 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   // Whether the displays are currently suspended.
   bool displays_suspended_;
 
+  // Virtual display control.
+  scoped_ptr<DisplaySnapshotVirtual> virtual_display_snapshot_;
+
   scoped_ptr<DisplayLayoutManager> layout_manager_;
 
   scoped_ptr<UpdateDisplayConfigurationTask> configuration_task_;