Add support for virtual displays

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 5a2b2d482f588ac404a1df659eeeef9d4ce54131..b1fc588797ea8348f99215c4bd2727b651fbcf2d 100644
--- a/ui/display/chromeos/display_configurator.h
+++ b/ui/display/chromeos/display_configurator.h
@@ -14,10 +14,12 @@
 
 #include "base/event_types.h"
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #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/chromeos/query_content_protection_task.h"
 #include "ui/display/display_export.h"
 #include "ui/display/types/display_constants.h"
@@ -269,6 +271,10 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   bool SetGammaRamp(int64_t display_id,
                     const std::vector<GammaRampRGBEntry>& lut);
 
+  // Enables/disables virtual display.
+  int64_t AddVirtualDisplay(gfx::Size display_size);
+  bool RemoveVirtualDisplay(int64_t display_id);
+
  private:
   class DisplayLayoutManagerImpl;
 
@@ -421,6 +427,12 @@ class DISPLAY_EXPORT DisplayConfigurator : public NativeDisplayObserver {
   // Whether the displays are currently suspended.
   bool displays_suspended_;
 
+  // Virtual display control.
+  ScopedVector<DisplaySnapshot> virtual_display_snapshots_;
+
+  // Last used virtual display id.
+  int64_t last_virtual_display_id_ = 0;

[oshima, 2015/11/24 22:19:27]

Can you factor out GetID in ui/display/util/edid_parser.cc and use
0x8000 as manufacturer id, and 0x as product code and this id as a output index?
please make sure that it will not overflow.

[robert.bradford, 2015/11/26 16:29:40]

Ah, that's a great solution. I wasn't very happy with it as it stood.

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